Finding the Fourth Proportional to 21,300,705.30, 31,932,395.55 and 12,784,430.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300,705.30 : 31,932,395.55 = 12,784,430.10 : x
2. Step 2: Convert to fraction form
   21,300,705.30/31,932,395.55 = 12,784,430.10/x
3. Step 3: Cross multiply
   21,300,705.30x = 31,932,395.55 × 12,784,430.10
4. Step 4: Simplify right side
   21,300,705.30x = 408,237,478,834,526.06
5. Step 5: Solve for x
   x = 408,237,478,834,526.06/21,300,705.30
6. Step 6: Final answer
   x = 19,165,444.20