Finding the Fourth Proportional to 72,711.57, 109,046.28 and 28,328.43

Step by Step Solution

1. Step 1: Write the proportion equation
   72,711.57 : 109,046.28 = 28,328.43 : x
2. Step 2: Convert to fraction form
   72,711.57/109,046.28 = 28,328.43/x
3. Step 3: Cross multiply
   72,711.57x = 109,046.28 × 28,328.43
4. Step 4: Simplify right side
   72,711.57x = 3,089,109,909.74
5. Step 5: Solve for x
   x = 3,089,109,909.74/72,711.57
6. Step 6: Final answer
   x = 42,484.43