Finding the Fourth Proportional to 2,627.12, 3,938.52 and 1,239.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,627.12 : 3,938.52 = 1,239.74 : x
2. Step 2: Convert to fraction form
   2,627.12/3,938.52 = 1,239.74/x
3. Step 3: Cross multiply
   2,627.12x = 3,938.52 × 1,239.74
4. Step 4: Simplify right side
   2,627.12x = 4,882,740.78
5. Step 5: Solve for x
   x = 4,882,740.78/2,627.12
6. Step 6: Final answer
   x = 1,858.59