Finding the Fourth Proportional to 21,404,345.87, 29,489,517.58 and 20,383,979.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,404,345.87 : 29,489,517.58 = 20,383,979.15 : x
2. Step 2: Convert to fraction form
   21,404,345.87/29,489,517.58 = 20,383,979.15/x
3. Step 3: Cross multiply
   21,404,345.87x = 29,489,517.58 × 20,383,979.15
4. Step 4: Simplify right side
   21,404,345.87x = 601,113,711,494,278.38
5. Step 5: Solve for x
   x = 601,113,711,494,278.38/21,404,345.87
6. Step 6: Final answer
   x = 28,083,722.58