Finding the Fourth Proportional to 2,103.80, 3,152.46 and 870.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.80 : 3,152.46 = 870.98 : x
2. Step 2: Convert to fraction form
   2,103.80/3,152.46 = 870.98/x
3. Step 3: Cross multiply
   2,103.80x = 3,152.46 × 870.98
4. Step 4: Simplify right side
   2,103.80x = 2,745,729.61
5. Step 5: Solve for x
   x = 2,745,729.61/2,103.80
6. Step 6: Final answer
   x = 1,305.13