Finding the Fourth Proportional to 52,672.89, 72,688.10 and 28,799.31

Step by Step Solution

1. Step 1: Write the proportion equation
   52,672.89 : 72,688.10 = 28,799.31 : x
2. Step 2: Convert to fraction form
   52,672.89/72,688.10 = 28,799.31/x
3. Step 3: Cross multiply
   52,672.89x = 72,688.10 × 28,799.31
4. Step 4: Simplify right side
   52,672.89x = 2,093,366,981.21
5. Step 5: Solve for x
   x = 2,093,366,981.21/52,672.89
6. Step 6: Final answer
   x = 39,742.78