Finding the Fourth Proportional to 2,643.76, 3,966.06 and 912.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.76 : 3,966.06 = 912.52 : x
2. Step 2: Convert to fraction form
   2,643.76/3,966.06 = 912.52/x
3. Step 3: Cross multiply
   2,643.76x = 3,966.06 × 912.52
4. Step 4: Simplify right side
   2,643.76x = 3,619,109.07
5. Step 5: Solve for x
   x = 3,619,109.07/2,643.76
6. Step 6: Final answer
   x = 1,368.92