Finding the Fourth Proportional to 1,123.30, 1,685.49 and 507.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.30 : 1,685.49 = 507.45 : x
2. Step 2: Convert to fraction form
   1,123.30/1,685.49 = 507.45/x
3. Step 3: Cross multiply
   1,123.30x = 1,685.49 × 507.45
4. Step 4: Simplify right side
   1,123.30x = 855,301.90
5. Step 5: Solve for x
   x = 855,301.90/1,123.30
6. Step 6: Final answer
   x = 761.42