Finding the Fourth Proportional to 1,402.55, 1,934.55 and 813.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.55 : 1,934.55 = 813.09 : x
2. Step 2: Convert to fraction form
   1,402.55/1,934.55 = 813.09/x
3. Step 3: Cross multiply
   1,402.55x = 1,934.55 × 813.09
4. Step 4: Simplify right side
   1,402.55x = 1,572,963.26
5. Step 5: Solve for x
   x = 1,572,963.26/1,402.55
6. Step 6: Final answer
   x = 1,121.51