Finding the Fourth Proportional to 78,150.83, 116,891.34 and 72,478.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,150.83 : 116,891.34 = 72,478.31 : x
2. Step 2: Convert to fraction form
   78,150.83/116,891.34 = 72,478.31/x
3. Step 3: Cross multiply
   78,150.83x = 116,891.34 × 72,478.31
4. Step 4: Simplify right side
   78,150.83x = 8,472,086,776.84
5. Step 5: Solve for x
   x = 8,472,086,776.84/78,150.83
6. Step 6: Final answer
   x = 108,406.87