Finding the Fourth Proportional to 2,520.38, 3,477.94 and 1,386.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.38 : 3,477.94 = 1,386.12 : x
2. Step 2: Convert to fraction form
   2,520.38/3,477.94 = 1,386.12/x
3. Step 3: Cross multiply
   2,520.38x = 3,477.94 × 1,386.12
4. Step 4: Simplify right side
   2,520.38x = 4,820,838.73
5. Step 5: Solve for x
   x = 4,820,838.73/2,520.38
6. Step 6: Final answer
   x = 1,912.75