Finding the Fourth Proportional to 2,103.71, 3,154.99 and 870.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.71 : 3,154.99 = 870.82 : x
2. Step 2: Convert to fraction form
   2,103.71/3,154.99 = 870.82/x
3. Step 3: Cross multiply
   2,103.71x = 3,154.99 × 870.82
4. Step 4: Simplify right side
   2,103.71x = 2,747,430.16
5. Step 5: Solve for x
   x = 2,747,430.16/2,103.71
6. Step 6: Final answer
   x = 1,305.99