Finding the Fourth Proportional to 1,350.78, 1,863.96 and 783.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,350.78 : 1,863.96 = 783.72 : x
2. Step 2: Convert to fraction form
   1,350.78/1,863.96 = 783.72/x
3. Step 3: Cross multiply
   1,350.78x = 1,863.96 × 783.72
4. Step 4: Simplify right side
   1,350.78x = 1,460,822.73
5. Step 5: Solve for x
   x = 1,460,822.73/1,350.78
6. Step 6: Final answer
   x = 1,081.47