Finding the Fourth Proportional to 76,831.28, 115,178.52 and 30,116.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,831.28 : 115,178.52 = 30,116.72 : x
2. Step 2: Convert to fraction form
   76,831.28/115,178.52 = 30,116.72/x
3. Step 3: Cross multiply
   76,831.28x = 115,178.52 × 30,116.72
4. Step 4: Simplify right side
   76,831.28x = 3,468,799,236.85
5. Step 5: Solve for x
   x = 3,468,799,236.85/76,831.28
6. Step 6: Final answer
   x = 45,148.27