Finding the Fourth Proportional to 123,610.60, 185,300.70 and 86,170.60

Step by Step Solution

1. Step 1: Write the proportion equation
   123,610.60 : 185,300.70 = 86,170.60 : x
2. Step 2: Convert to fraction form
   123,610.60/185,300.70 = 86,170.60/x
3. Step 3: Cross multiply
   123,610.60x = 185,300.70 × 86,170.60
4. Step 4: Simplify right side
   123,610.60x = 15,967,472,499.42
5. Step 5: Solve for x
   x = 15,967,472,499.42/123,610.60
6. Step 6: Final answer
   x = 129,175.59