Finding the Fourth Proportional to 1,108.47, 1,530.89 and 862.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.47 : 1,530.89 = 862.72 : x
2. Step 2: Convert to fraction form
   1,108.47/1,530.89 = 862.72/x
3. Step 3: Cross multiply
   1,108.47x = 1,530.89 × 862.72
4. Step 4: Simplify right side
   1,108.47x = 1,320,729.42
5. Step 5: Solve for x
   x = 1,320,729.42/1,108.47
6. Step 6: Final answer
   x = 1,191.49