Finding the Fourth Proportional to 1,402.69, 1,935.49 and 813.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.69 : 1,935.49 = 813.12 : x
2. Step 2: Convert to fraction form
   1,402.69/1,935.49 = 813.12/x
3. Step 3: Cross multiply
   1,402.69x = 1,935.49 × 813.12
4. Step 4: Simplify right side
   1,402.69x = 1,573,785.63
5. Step 5: Solve for x
   x = 1,573,785.63/1,402.69
6. Step 6: Final answer
   x = 1,121.98