Finding the Fourth Proportional to 2,499.78, 3,749.80 and 1,039.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.78 : 3,749.80 = 1,039.08 : x
2. Step 2: Convert to fraction form
   2,499.78/3,749.80 = 1,039.08/x
3. Step 3: Cross multiply
   2,499.78x = 3,749.80 × 1,039.08
4. Step 4: Simplify right side
   2,499.78x = 3,896,342.18
5. Step 5: Solve for x
   x = 3,896,342.18/2,499.78
6. Step 6: Final answer
   x = 1,558.67