Finding the Fourth Proportional to 78,443.28, 108,250.80 and 42,631.68

Step by Step Solution

1. Step 1: Write the proportion equation
   78,443.28 : 108,250.80 = 42,631.68 : x
2. Step 2: Convert to fraction form
   78,443.28/108,250.80 = 42,631.68/x
3. Step 3: Cross multiply
   78,443.28x = 108,250.80 × 42,631.68
4. Step 4: Simplify right side
   78,443.28x = 4,614,913,465.34
5. Step 5: Solve for x
   x = 4,614,913,465.34/78,443.28
6. Step 6: Final answer
   x = 58,831.21