Finding the Fourth Proportional to 1,402.72, 1,935.24 and 813.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.72 : 1,935.24 = 813.04 : x
2. Step 2: Convert to fraction form
   1,402.72/1,935.24 = 813.04/x
3. Step 3: Cross multiply
   1,402.72x = 1,935.24 × 813.04
4. Step 4: Simplify right side
   1,402.72x = 1,573,427.53
5. Step 5: Solve for x
   x = 1,573,427.53/1,402.72
6. Step 6: Final answer
   x = 1,121.70