Finding the Fourth Proportional to 2,622.72, 3,932.88 and 890.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.72 : 3,932.88 = 890.16 : x
2. Step 2: Convert to fraction form
   2,622.72/3,932.88 = 890.16/x
3. Step 3: Cross multiply
   2,622.72x = 3,932.88 × 890.16
4. Step 4: Simplify right side
   2,622.72x = 3,500,892.46
5. Step 5: Solve for x
   x = 3,500,892.46/2,622.72
6. Step 6: Final answer
   x = 1,334.83