Finding the Fourth Proportional to 2,106.76, 3,157.38 and 872.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.76 : 3,157.38 = 872.71 : x
2. Step 2: Convert to fraction form
   2,106.76/3,157.38 = 872.71/x
3. Step 3: Cross multiply
   2,106.76x = 3,157.38 × 872.71
4. Step 4: Simplify right side
   2,106.76x = 2,755,477.10
5. Step 5: Solve for x
   x = 2,755,477.10/2,106.76
6. Step 6: Final answer
   x = 1,307.92