Finding the Fourth Proportional to 2,620.71, 3,931.02 and 889.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.71 : 3,931.02 = 889.29 : x
2. Step 2: Convert to fraction form
   2,620.71/3,931.02 = 889.29/x
3. Step 3: Cross multiply
   2,620.71x = 3,931.02 × 889.29
4. Step 4: Simplify right side
   2,620.71x = 3,495,816.78
5. Step 5: Solve for x
   x = 3,495,816.78/2,620.71
6. Step 6: Final answer
   x = 1,333.92