Finding the Fourth Proportional to 1,339.24, 1,847.88 and 841.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.24 : 1,847.88 = 841.72 : x
2. Step 2: Convert to fraction form
   1,339.24/1,847.88 = 841.72/x
3. Step 3: Cross multiply
   1,339.24x = 1,847.88 × 841.72
4. Step 4: Simplify right side
   1,339.24x = 1,555,397.55
5. Step 5: Solve for x
   x = 1,555,397.55/1,339.24
6. Step 6: Final answer
   x = 1,161.40