Finding the Fourth Proportional to 2,624.78, 3,938.49 and 1,238.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,624.78 : 3,938.49 = 1,238.06 : x
2. Step 2: Convert to fraction form
   2,624.78/3,938.49 = 1,238.06/x
3. Step 3: Cross multiply
   2,624.78x = 3,938.49 × 1,238.06
4. Step 4: Simplify right side
   2,624.78x = 4,876,096.78
5. Step 5: Solve for x
   x = 4,876,096.78/2,624.78
6. Step 6: Final answer
   x = 1,857.71