Finding the Fourth Proportional to 2,448.72, 3,379.21 and 1,386.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,448.72 : 3,379.21 = 1,386.70 : x
2. Step 2: Convert to fraction form
   2,448.72/3,379.21 = 1,386.70/x
3. Step 3: Cross multiply
   2,448.72x = 3,379.21 × 1,386.70
4. Step 4: Simplify right side
   2,448.72x = 4,685,938.59
5. Step 5: Solve for x
   x = 4,685,938.59/2,448.72
6. Step 6: Final answer
   x = 1,913.63