Finding the Fourth Proportional to 2,621.66, 3,932.89 and 889.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.66 : 3,932.89 = 889.88 : x
2. Step 2: Convert to fraction form
   2,621.66/3,932.89 = 889.88/x
3. Step 3: Cross multiply
   2,621.66x = 3,932.89 × 889.88
4. Step 4: Simplify right side
   2,621.66x = 3,499,778.26
5. Step 5: Solve for x
   x = 3,499,778.26/2,621.66
6. Step 6: Final answer
   x = 1,334.95