Finding the Fourth Proportional to 1,402.30, 1,935.18 and 813.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.30 : 1,935.18 = 813.18 : x
2. Step 2: Convert to fraction form
   1,402.30/1,935.18 = 813.18/x
3. Step 3: Cross multiply
   1,402.30x = 1,935.18 × 813.18
4. Step 4: Simplify right side
   1,402.30x = 1,573,645.61
5. Step 5: Solve for x
   x = 1,573,645.61/1,402.30
6. Step 6: Final answer
   x = 1,122.19