Finding the Fourth Proportional to 2,490.50, 3,436.89 and 1,386.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,490.50 : 3,436.89 = 1,386.50 : x
2. Step 2: Convert to fraction form
   2,490.50/3,436.89 = 1,386.50/x
3. Step 3: Cross multiply
   2,490.50x = 3,436.89 × 1,386.50
4. Step 4: Simplify right side
   2,490.50x = 4,765,247.99
5. Step 5: Solve for x
   x = 4,765,247.99/2,490.50
6. Step 6: Final answer
   x = 1,913.37