Finding the Fourth Proportional to 2,799.71, 4,200.51 and 1,239.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,799.71 : 4,200.51 = 1,239.50 : x
2. Step 2: Convert to fraction form
   2,799.71/4,200.51 = 1,239.50/x
3. Step 3: Cross multiply
   2,799.71x = 4,200.51 × 1,239.50
4. Step 4: Simplify right side
   2,799.71x = 5,206,540.32
5. Step 5: Solve for x
   x = 5,206,540.32/2,799.71
6. Step 6: Final answer
   x = 1,859.67