Finding the Fourth Proportional to 1,132.89, 1,698.91 and 392.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,132.89 : 1,698.91 = 392.31 : x
2. Step 2: Convert to fraction form
   1,132.89/1,698.91 = 392.31/x
3. Step 3: Cross multiply
   1,132.89x = 1,698.91 × 392.31
4. Step 4: Simplify right side
   1,132.89x = 666,499.38
5. Step 5: Solve for x
   x = 666,499.38/1,132.89
6. Step 6: Final answer
   x = 588.32