Finding the Fourth Proportional to 1,123.47, 1,686.15 and 576.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.47 : 1,686.15 = 576.18 : x
2. Step 2: Convert to fraction form
   1,123.47/1,686.15 = 576.18/x
3. Step 3: Cross multiply
   1,123.47x = 1,686.15 × 576.18
4. Step 4: Simplify right side
   1,123.47x = 971,525.91
5. Step 5: Solve for x
   x = 971,525.91/1,123.47
6. Step 6: Final answer
   x = 864.75