Finding the Fourth Proportional to 21,404,344.87, 29,489,516.20 and 20,383,978.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,404,344.87 : 29,489,516.20 = 20,383,978.15 : x
2. Step 2: Convert to fraction form
   21,404,344.87/29,489,516.20 = 20,383,978.15/x
3. Step 3: Cross multiply
   21,404,344.87x = 29,489,516.20 × 20,383,978.15
4. Step 4: Simplify right side
   21,404,344.87x = 601,113,653,937,213
5. Step 5: Solve for x
   x = 601,113,653,937,213/21,404,344.87
6. Step 6: Final answer
   x = 28,083,721.20