Finding the Fourth Proportional to 3,816.78, 5,265.61 and 2,490

Step by Step Solution

1. Step 1: Write the proportion equation
   3,816.78 : 5,265.61 = 2,490 : x
2. Step 2: Convert to fraction form
   3,816.78/5,265.61 = 2,490/x
3. Step 3: Cross multiply
   3,816.78x = 5,265.61 × 2,490
4. Step 4: Simplify right side
   3,816.78x = 13,111,368.90
5. Step 5: Solve for x
   x = 13,111,368.90/3,816.78
6. Step 6: Final answer
   x = 3,435.19