Finding the Fourth Proportional to 1,248.16, 1,722.72 and 783.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,248.16 : 1,722.72 = 783.52 : x
2. Step 2: Convert to fraction form
   1,248.16/1,722.72 = 783.52/x
3. Step 3: Cross multiply
   1,248.16x = 1,722.72 × 783.52
4. Step 4: Simplify right side
   1,248.16x = 1,349,785.57
5. Step 5: Solve for x
   x = 1,349,785.57/1,248.16
6. Step 6: Final answer
   x = 1,081.42