Finding the Fourth Proportional to 2,103.86, 3,153.47 and 870.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.86 : 3,153.47 = 870.59 : x
2. Step 2: Convert to fraction form
   2,103.86/3,153.47 = 870.59/x
3. Step 3: Cross multiply
   2,103.86x = 3,153.47 × 870.59
4. Step 4: Simplify right side
   2,103.86x = 2,745,382.98
5. Step 5: Solve for x
   x = 2,745,382.98/2,103.86
6. Step 6: Final answer
   x = 1,304.93