Finding the Fourth Proportional to 1,039.80, 1,435.50 and 725.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.80 : 1,435.50 = 725.52 : x
2. Step 2: Convert to fraction form
   1,039.80/1,435.50 = 725.52/x
3. Step 3: Cross multiply
   1,039.80x = 1,435.50 × 725.52
4. Step 4: Simplify right side
   1,039.80x = 1,041,483.96
5. Step 5: Solve for x
   x = 1,041,483.96/1,039.80
6. Step 6: Final answer
   x = 1,001.62