Finding the Fourth Proportional to 72,711.18, 109,038.78 and 28,332.09

Step by Step Solution

1. Step 1: Write the proportion equation
   72,711.18 : 109,038.78 = 28,332.09 : x
2. Step 2: Convert to fraction form
   72,711.18/109,038.78 = 28,332.09/x
3. Step 3: Cross multiply
   72,711.18x = 109,038.78 × 28,332.09
4. Step 4: Simplify right side
   72,711.18x = 3,089,296,528.45
5. Step 5: Solve for x
   x = 3,089,296,528.45/72,711.18
6. Step 6: Final answer
   x = 42,487.23