Finding the Fourth Proportional to 2,870.91, 4,302.70 and 2,499.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.91 : 4,302.70 = 2,499.20 : x
2. Step 2: Convert to fraction form
   2,870.91/4,302.70 = 2,499.20/x
3. Step 3: Cross multiply
   2,870.91x = 4,302.70 × 2,499.20
4. Step 4: Simplify right side
   2,870.91x = 10,753,305.59
5. Step 5: Solve for x
   x = 10,753,305.59/2,870.91
6. Step 6: Final answer
   x = 3,745.60