Finding the Fourth Proportional to 1,123.89, 1,684.61 and 575.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.89 : 1,684.61 = 575.31 : x
2. Step 2: Convert to fraction form
   1,123.89/1,684.61 = 575.31/x
3. Step 3: Cross multiply
   1,123.89x = 1,684.61 × 575.31
4. Step 4: Simplify right side
   1,123.89x = 969,172.98
5. Step 5: Solve for x
   x = 969,172.98/1,123.89
6. Step 6: Final answer
   x = 862.34