Finding the Fourth Proportional to 1,199.31, 1,655.20 and 868.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,199.31 : 1,655.20 = 868.83 : x
2. Step 2: Convert to fraction form
   1,199.31/1,655.20 = 868.83/x
3. Step 3: Cross multiply
   1,199.31x = 1,655.20 × 868.83
4. Step 4: Simplify right side
   1,199.31x = 1,438,087.42
5. Step 5: Solve for x
   x = 1,438,087.42/1,199.31
6. Step 6: Final answer
   x = 1,199.10