Finding the Fourth Proportional to 1,867.50, 2,577.15 and 1,039.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,867.50 : 2,577.15 = 1,039.50 : x
2. Step 2: Convert to fraction form
   1,867.50/2,577.15 = 1,039.50/x
3. Step 3: Cross multiply
   1,867.50x = 2,577.15 × 1,039.50
4. Step 4: Simplify right side
   1,867.50x = 2,678,947.43
5. Step 5: Solve for x
   x = 2,678,947.43/1,867.50
6. Step 6: Final answer
   x = 1,434.51