Finding the Fourth Proportional to 1,123.86, 1,686.07 and 567.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.86 : 1,686.07 = 567.20 : x
2. Step 2: Convert to fraction form
   1,123.86/1,686.07 = 567.20/x
3. Step 3: Cross multiply
   1,123.86x = 1,686.07 × 567.20
4. Step 4: Simplify right side
   1,123.86x = 956,343.83
5. Step 5: Solve for x
   x = 956,343.83/1,123.86
6. Step 6: Final answer
   x = 850.94