Finding the Fourth Proportional to 415,363.17, 623,044.89 and 215,580.72

Step by Step Solution

1. Step 1: Write the proportion equation
   415,363.17 : 623,044.89 = 215,580.72 : x
2. Step 2: Convert to fraction form
   415,363.17/623,044.89 = 215,580.72/x
3. Step 3: Cross multiply
   415,363.17x = 623,044.89 × 215,580.72
4. Step 4: Simplify right side
   415,363.17x = 134,316,465,978.52
5. Step 5: Solve for x
   x = 134,316,465,978.52/415,363.17
6. Step 6: Final answer
   x = 323,371.15