Finding the Fourth Proportional to 1,042.91, 1,439.27 and 623.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.91 : 1,439.27 = 623.33 : x
2. Step 2: Convert to fraction form
   1,042.91/1,439.27 = 623.33/x
3. Step 3: Cross multiply
   1,042.91x = 1,439.27 × 623.33
4. Step 4: Simplify right side
   1,042.91x = 897,129.86
5. Step 5: Solve for x
   x = 897,129.86/1,042.91
6. Step 6: Final answer
   x = 860.22