Finding the Fourth Proportional to 123,580.80, 170,604.72 and 78,305.76

Step by Step Solution

1. Step 1: Write the proportion equation
   123,580.80 : 170,604.72 = 78,305.76 : x
2. Step 2: Convert to fraction form
   123,580.80/170,604.72 = 78,305.76/x
3. Step 3: Cross multiply
   123,580.80x = 170,604.72 × 78,305.76
4. Step 4: Simplify right side
   123,580.80x = 13,359,332,259.19
5. Step 5: Solve for x
   x = 13,359,332,259.19/123,580.80
6. Step 6: Final answer
   x = 108,102.00