Finding the Fourth Proportional to 123,687.32, 185,427.09 and 86,136.53

Step by Step Solution

1. Step 1: Write the proportion equation
   123,687.32 : 185,427.09 = 86,136.53 : x
2. Step 2: Convert to fraction form
   123,687.32/185,427.09 = 86,136.53/x
3. Step 3: Cross multiply
   123,687.32x = 185,427.09 × 86,136.53
4. Step 4: Simplify right side
   123,687.32x = 15,972,045,173.46
5. Step 5: Solve for x
   x = 15,972,045,173.46/123,687.32
6. Step 6: Final answer
   x = 129,132.44