Finding the Fourth Proportional to 2,621.64, 3,932.52 and 890.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.64 : 3,932.52 = 890.28 : x
2. Step 2: Convert to fraction form
   2,621.64/3,932.52 = 890.28/x
3. Step 3: Cross multiply
   2,621.64x = 3,932.52 × 890.28
4. Step 4: Simplify right side
   2,621.64x = 3,501,043.91
5. Step 5: Solve for x
   x = 3,501,043.91/2,621.64
6. Step 6: Final answer
   x = 1,335.44