Finding the Fourth Proportional to 2,643.50, 3,965.52 and 912.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.50 : 3,965.52 = 912.13 : x
2. Step 2: Convert to fraction form
   2,643.50/3,965.52 = 912.13/x
3. Step 3: Cross multiply
   2,643.50x = 3,965.52 × 912.13
4. Step 4: Simplify right side
   2,643.50x = 3,617,069.76
5. Step 5: Solve for x
   x = 3,617,069.76/2,643.50
6. Step 6: Final answer
   x = 1,368.29