Finding the Fourth Proportional to 2,101.17, 3,149.45 and 867.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.17 : 3,149.45 = 867.91 : x
2. Step 2: Convert to fraction form
   2,101.17/3,149.45 = 867.91/x
3. Step 3: Cross multiply
   2,101.17x = 3,149.45 × 867.91
4. Step 4: Simplify right side
   2,101.17x = 2,733,439.15
5. Step 5: Solve for x
   x = 2,733,439.15/2,101.17
6. Step 6: Final answer
   x = 1,300.91