Finding the Fourth Proportional to 1,042.50, 1,439.88 and 762.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.50 : 1,439.88 = 762.28 : x
2. Step 2: Convert to fraction form
   1,042.50/1,439.88 = 762.28/x
3. Step 3: Cross multiply
   1,042.50x = 1,439.88 × 762.28
4. Step 4: Simplify right side
   1,042.50x = 1,097,585.27
5. Step 5: Solve for x
   x = 1,097,585.27/1,042.50
6. Step 6: Final answer
   x = 1,052.84