Finding the Fourth Proportional to 1,399.52, 1,931.52 and 810.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.52 : 1,931.52 = 810.24 : x
2. Step 2: Convert to fraction form
   1,399.52/1,931.52 = 810.24/x
3. Step 3: Cross multiply
   1,399.52x = 1,931.52 × 810.24
4. Step 4: Simplify right side
   1,399.52x = 1,564,994.76
5. Step 5: Solve for x
   x = 1,564,994.76/1,399.52
6. Step 6: Final answer
   x = 1,118.24