Finding the Fourth Proportional to 1,123.38, 1,685.15 and 507.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.38 : 1,685.15 = 507.43 : x
2. Step 2: Convert to fraction form
   1,123.38/1,685.15 = 507.43/x
3. Step 3: Cross multiply
   1,123.38x = 1,685.15 × 507.43
4. Step 4: Simplify right side
   1,123.38x = 855,087.24
5. Step 5: Solve for x
   x = 855,087.24/1,123.38
6. Step 6: Final answer
   x = 761.18