Finding the Fourth Proportional to 1,339.18, 1,847.46 and 842.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.18 : 1,847.46 = 842.10 : x
2. Step 2: Convert to fraction form
   1,339.18/1,847.46 = 842.10/x
3. Step 3: Cross multiply
   1,339.18x = 1,847.46 × 842.10
4. Step 4: Simplify right side
   1,339.18x = 1,555,746.07
5. Step 5: Solve for x
   x = 1,555,746.07/1,339.18
6. Step 6: Final answer
   x = 1,161.72