Finding the Fourth Proportional to 2,103.20, 3,152.50 and 869.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.20 : 3,152.50 = 869.95 : x
2. Step 2: Convert to fraction form
   2,103.20/3,152.50 = 869.95/x
3. Step 3: Cross multiply
   2,103.20x = 3,152.50 × 869.95
4. Step 4: Simplify right side
   2,103.20x = 2,742,507.32
5. Step 5: Solve for x
   x = 2,742,507.32/2,103.20
6. Step 6: Final answer
   x = 1,303.97