Finding the Fourth Proportional to 1,112.73, 1,535.54 and 781.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.73 : 1,535.54 = 781.71 : x
2. Step 2: Convert to fraction form
   1,112.73/1,535.54 = 781.71/x
3. Step 3: Cross multiply
   1,112.73x = 1,535.54 × 781.71
4. Step 4: Simplify right side
   1,112.73x = 1,200,343.06
5. Step 5: Solve for x
   x = 1,200,343.06/1,112.73
6. Step 6: Final answer
   x = 1,078.74