Finding the Fourth Proportional to 1,551,978,526.56, 2,141,410,650.96 and 891,801,258.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,551,978,526.56 : 2,141,410,650.96 = 891,801,258.72 : x
2. Step 2: Convert to fraction form
   1,551,978,526.56/2,141,410,650.96 = 891,801,258.72/x
3. Step 3: Cross multiply
   1,551,978,526.56x = 2,141,410,650.96 × 891,801,258.72
4. Step 4: Simplify right side
   1,551,978,526.56x = 1,909,712,713,962,542,592
5. Step 5: Solve for x
   x = 1,909,712,713,962,542,592/1,551,978,526.56
6. Step 6: Final answer
   x = 1,230,502,021.31