Finding the Fourth Proportional to 123,760.69, 185,611.30 and 57,136.81

Step by Step Solution

1. Step 1: Write the proportion equation
   123,760.69 : 185,611.30 = 57,136.81 : x
2. Step 2: Convert to fraction form
   123,760.69/185,611.30 = 57,136.81/x
3. Step 3: Cross multiply
   123,760.69x = 185,611.30 × 57,136.81
4. Step 4: Simplify right side
   123,760.69x = 10,605,236,975.08
5. Step 5: Solve for x
   x = 10,605,236,975.08/123,760.69
6. Step 6: Final answer
   x = 85,691.48