Finding the Fourth Proportional to 1,342.91, 1,853.22 and 783.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.91 : 1,853.22 = 783.72 : x
2. Step 2: Convert to fraction form
   1,342.91/1,853.22 = 783.72/x
3. Step 3: Cross multiply
   1,342.91x = 1,853.22 × 783.72
4. Step 4: Simplify right side
   1,342.91x = 1,452,405.58
5. Step 5: Solve for x
   x = 1,452,405.58/1,342.91
6. Step 6: Final answer
   x = 1,081.54