Finding the Fourth Proportional to 1,042.92, 1,438.89 and 623.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.92 : 1,438.89 = 623.34 : x
2. Step 2: Convert to fraction form
   1,042.92/1,438.89 = 623.34/x
3. Step 3: Cross multiply
   1,042.92x = 1,438.89 × 623.34
4. Step 4: Simplify right side
   1,042.92x = 896,917.69
5. Step 5: Solve for x
   x = 896,917.69/1,042.92
6. Step 6: Final answer
   x = 860.01