Finding the Fourth Proportional to 2,870.64, 4,308.12 and 2,103.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.64 : 4,308.12 = 2,103.12 : x
2. Step 2: Convert to fraction form
   2,870.64/4,308.12 = 2,103.12/x
3. Step 3: Cross multiply
   2,870.64x = 4,308.12 × 2,103.12
4. Step 4: Simplify right side
   2,870.64x = 9,060,493.33
5. Step 5: Solve for x
   x = 9,060,493.33/2,870.64
6. Step 6: Final answer
   x = 3,156.26