Finding the Fourth Proportional to 123,763.35, 185,615.30 and 57,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,763.35 : 185,615.30 = 57,139.50 : x
2. Step 2: Convert to fraction form
   123,763.35/185,615.30 = 57,139.50/x
3. Step 3: Cross multiply
   123,763.35x = 185,615.30 × 57,139.50
4. Step 4: Simplify right side
   123,763.35x = 10,605,965,148.65
5. Step 5: Solve for x
   x = 10,605,965,148.65/123,763.35
6. Step 6: Final answer
   x = 85,695.52