Finding the Fourth Proportional to 1,218,048,493.52, 1,680,908,621.64 and 661,131,655.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218,048,493.52 : 1,680,908,621.64 = 661,131,655.76 : x
2. Step 2: Convert to fraction form
   1,218,048,493.52/1,680,908,621.64 = 661,131,655.76/x
3. Step 3: Cross multiply
   1,218,048,493.52x = 1,680,908,621.64 × 661,131,655.76
4. Step 4: Simplify right side
   1,218,048,493.52x = 1,111,301,900,206,112,640
5. Step 5: Solve for x
   x = 1,111,301,900,206,112,640/1,218,048,493.52
6. Step 6: Final answer
   x = 912,362,607.99