Finding the Fourth Proportional to 82,438.80, 123,530.31 and 57,187.62

Step by Step Solution

1. Step 1: Write the proportion equation
   82,438.80 : 123,530.31 = 57,187.62 : x
2. Step 2: Convert to fraction form
   82,438.80/123,530.31 = 57,187.62/x
3. Step 3: Cross multiply
   82,438.80x = 123,530.31 × 57,187.62
4. Step 4: Simplify right side
   82,438.80x = 7,064,404,426.76
5. Step 5: Solve for x
   x = 7,064,404,426.76/82,438.80
6. Step 6: Final answer
   x = 85,692.71