Finding the Fourth Proportional to 1,131.72, 1,562.88 and 862.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.72 : 1,562.88 = 862.08 : x
2. Step 2: Convert to fraction form
   1,131.72/1,562.88 = 862.08/x
3. Step 3: Cross multiply
   1,131.72x = 1,562.88 × 862.08
4. Step 4: Simplify right side
   1,131.72x = 1,347,327.59
5. Step 5: Solve for x
   x = 1,347,327.59/1,131.72
6. Step 6: Final answer
   x = 1,190.51