Finding the Fourth Proportional to 1,135.89, 1,565.46 and 781.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,135.89 : 1,565.46 = 781.83 : x
2. Step 2: Convert to fraction form
   1,135.89/1,565.46 = 781.83/x
3. Step 3: Cross multiply
   1,135.89x = 1,565.46 × 781.83
4. Step 4: Simplify right side
   1,135.89x = 1,223,923.59
5. Step 5: Solve for x
   x = 1,223,923.59/1,135.89
6. Step 6: Final answer
   x = 1,077.50