Finding the Fourth Proportional to 123,581.28, 170,479.28 and 78,182.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123,581.28 : 170,479.28 = 78,182.72 : x
2. Step 2: Convert to fraction form
   123,581.28/170,479.28 = 78,182.72/x
3. Step 3: Cross multiply
   123,581.28x = 170,479.28 × 78,182.72
4. Step 4: Simplify right side
   123,581.28x = 13,328,533,814.04
5. Step 5: Solve for x
   x = 13,328,533,814.04/123,581.28
6. Step 6: Final answer
   x = 107,852.37