Finding the Fourth Proportional to 1,402.57, 1,935.56 and 813.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.57 : 1,935.56 = 813.21 : x
2. Step 2: Convert to fraction form
   1,402.57/1,935.56 = 813.21/x
3. Step 3: Cross multiply
   1,402.57x = 1,935.56 × 813.21
4. Step 4: Simplify right side
   1,402.57x = 1,574,016.75
5. Step 5: Solve for x
   x = 1,574,016.75/1,402.57
6. Step 6: Final answer
   x = 1,122.24