Finding the Fourth Proportional to 123,302.91, 170,139.76 and 74,879.65

Step by Step Solution

1. Step 1: Write the proportion equation
   123,302.91 : 170,139.76 = 74,879.65 : x
2. Step 2: Convert to fraction form
   123,302.91/170,139.76 = 74,879.65/x
3. Step 3: Cross multiply
   123,302.91x = 170,139.76 × 74,879.65
4. Step 4: Simplify right side
   123,302.91x = 12,740,005,679.88
5. Step 5: Solve for x
   x = 12,740,005,679.88/123,302.91
6. Step 6: Final answer
   x = 103,322.83