Finding the Fourth Proportional to 72,561, 108,799.20 and 28,135.86

Step by Step Solution

1. Step 1: Write the proportion equation
   72,561 : 108,799.20 = 28,135.86 : x
2. Step 2: Convert to fraction form
   72,561/108,799.20 = 28,135.86/x
3. Step 3: Cross multiply
   72,561x = 108,799.20 × 28,135.86
4. Step 4: Simplify right side
   72,561x = 3,061,159,059.31
5. Step 5: Solve for x
   x = 3,061,159,059.31/72,561
6. Step 6: Final answer
   x = 42,187.39