Finding the Fourth Proportional to 123,386.61, 170,301.63 and 80,290.15

Step by Step Solution

1. Step 1: Write the proportion equation
   123,386.61 : 170,301.63 = 80,290.15 : x
2. Step 2: Convert to fraction form
   123,386.61/170,301.63 = 80,290.15/x
3. Step 3: Cross multiply
   123,386.61x = 170,301.63 × 80,290.15
4. Step 4: Simplify right side
   123,386.61x = 13,673,543,417.94
5. Step 5: Solve for x
   x = 13,673,543,417.94/123,386.61
6. Step 6: Final answer
   x = 110,818.70