Finding the Fourth Proportional to 1,399.24, 1,931.34 and 810.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.24 : 1,931.34 = 810.01 : x
2. Step 2: Convert to fraction form
   1,399.24/1,931.34 = 810.01/x
3. Step 3: Cross multiply
   1,399.24x = 1,931.34 × 810.01
4. Step 4: Simplify right side
   1,399.24x = 1,564,404.71
5. Step 5: Solve for x
   x = 1,564,404.71/1,399.24
6. Step 6: Final answer
   x = 1,118.04