Finding the Fourth Proportional to 2,625.68, 3,939.89 and 1,238.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,625.68 : 3,939.89 = 1,238.30 : x
2. Step 2: Convert to fraction form
   2,625.68/3,939.89 = 1,238.30/x
3. Step 3: Cross multiply
   2,625.68x = 3,939.89 × 1,238.30
4. Step 4: Simplify right side
   2,625.68x = 4,878,783.80
5. Step 5: Solve for x
   x = 4,878,783.80/2,625.68
6. Step 6: Final answer
   x = 1,858.10