Finding the Fourth Proportional to 21,609,978.24, 29,816,913.60 and 12,906,572.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,609,978.24 : 29,816,913.60 = 12,906,572.16 : x
2. Step 2: Convert to fraction form
   21,609,978.24/29,816,913.60 = 12,906,572.16/x
3. Step 3: Cross multiply
   21,609,978.24x = 29,816,913.60 × 12,906,572.16
4. Step 4: Simplify right side
   21,609,978.24x = 384,834,146,966,885.38
5. Step 5: Solve for x
   x = 384,834,146,966,885.38/21,609,978.24
6. Step 6: Final answer
   x = 17,808,169.11