Finding the Fourth Proportional to 2,499.50, 3,747.20 and 1,039.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.50 : 3,747.20 = 1,039.70 : x
2. Step 2: Convert to fraction form
   2,499.50/3,747.20 = 1,039.70/x
3. Step 3: Cross multiply
   2,499.50x = 3,747.20 × 1,039.70
4. Step 4: Simplify right side
   2,499.50x = 3,895,963.84
5. Step 5: Solve for x
   x = 3,895,963.84/2,499.50
6. Step 6: Final answer
   x = 1,558.70