Finding the Fourth Proportional to 2,499.72, 3,449.66 and 1,380.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.72 : 3,449.66 = 1,380.72 : x
2. Step 2: Convert to fraction form
   2,499.72/3,449.66 = 1,380.72/x
3. Step 3: Cross multiply
   2,499.72x = 3,449.66 × 1,380.72
4. Step 4: Simplify right side
   2,499.72x = 4,763,014.56
5. Step 5: Solve for x
   x = 4,763,014.56/2,499.72
6. Step 6: Final answer
   x = 1,905.42