Finding the Fourth Proportional to 72,470.40, 108,778.56 and 42,917.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,470.40 : 108,778.56 = 42,917.76 : x
2. Step 2: Convert to fraction form
   72,470.40/108,778.56 = 42,917.76/x
3. Step 3: Cross multiply
   72,470.40x = 108,778.56 × 42,917.76
4. Step 4: Simplify right side
   72,470.40x = 4,668,532,131.23
5. Step 5: Solve for x
   x = 4,668,532,131.23/72,470.40
6. Step 6: Final answer
   x = 64,419.85