Finding the Fourth Proportional to 1,343.16, 1,853.52 and 783.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.16 : 1,853.52 = 783.72 : x
2. Step 2: Convert to fraction form
   1,343.16/1,853.52 = 783.72/x
3. Step 3: Cross multiply
   1,343.16x = 1,853.52 × 783.72
4. Step 4: Simplify right side
   1,343.16x = 1,452,640.69
5. Step 5: Solve for x
   x = 1,452,640.69/1,343.16
6. Step 6: Final answer
   x = 1,081.51