Finding the Fourth Proportional to 2,103.85, 3,155.64 and 870.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.85 : 3,155.64 = 870.94 : x
2. Step 2: Convert to fraction form
   2,103.85/3,155.64 = 870.94/x
3. Step 3: Cross multiply
   2,103.85x = 3,155.64 × 870.94
4. Step 4: Simplify right side
   2,103.85x = 2,748,373.10
5. Step 5: Solve for x
   x = 2,748,373.10/2,103.85
6. Step 6: Final answer
   x = 1,306.35