Finding the Fourth Proportional to 2,100.70, 3,151.58 and 868.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.70 : 3,151.58 = 868.47 : x
2. Step 2: Convert to fraction form
   2,100.70/3,151.58 = 868.47/x
3. Step 3: Cross multiply
   2,100.70x = 3,151.58 × 868.47
4. Step 4: Simplify right side
   2,100.70x = 2,737,036.52
5. Step 5: Solve for x
   x = 2,737,036.52/2,100.70
6. Step 6: Final answer
   x = 1,302.91