Finding the Fourth Proportional to 1,145.24, 1,581.72 and 886.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.24 : 1,581.72 = 886.40 : x
2. Step 2: Convert to fraction form
   1,145.24/1,581.72 = 886.40/x
3. Step 3: Cross multiply
   1,145.24x = 1,581.72 × 886.40
4. Step 4: Simplify right side
   1,145.24x = 1,402,036.61
5. Step 5: Solve for x
   x = 1,402,036.61/1,145.24
6. Step 6: Final answer
   x = 1,224.23