Finding the Fourth Proportional to 1,402.81, 1,935.79 and 813.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.81 : 1,935.79 = 813.24 : x
2. Step 2: Convert to fraction form
   1,402.81/1,935.79 = 813.24/x
3. Step 3: Cross multiply
   1,402.81x = 1,935.79 × 813.24
4. Step 4: Simplify right side
   1,402.81x = 1,574,259.83
5. Step 5: Solve for x
   x = 1,574,259.83/1,402.81
6. Step 6: Final answer
   x = 1,122.22