Finding the Fourth Proportional to 1,403.90, 1,937.22 and 814.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.90 : 1,937.22 = 814.55 : x
2. Step 2: Convert to fraction form
   1,403.90/1,937.22 = 814.55/x
3. Step 3: Cross multiply
   1,403.90x = 1,937.22 × 814.55
4. Step 4: Simplify right side
   1,403.90x = 1,577,952.86
5. Step 5: Solve for x
   x = 1,577,952.86/1,403.90
6. Step 6: Final answer
   x = 1,123.98