Finding the Fourth Proportional to 52,689.61, 72,711.50 and 28,490.40

Step by Step Solution

1. Step 1: Write the proportion equation
   52,689.61 : 72,711.50 = 28,490.40 : x
2. Step 2: Convert to fraction form
   52,689.61/72,711.50 = 28,490.40/x
3. Step 3: Cross multiply
   52,689.61x = 72,711.50 × 28,490.40
4. Step 4: Simplify right side
   52,689.61x = 2,071,579,577.15
5. Step 5: Solve for x
   x = 2,071,579,577.15/52,689.61
6. Step 6: Final answer
   x = 39,316.67