Finding the Fourth Proportional to 2,499.86, 3,449.78 and 1,380.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.86 : 3,449.78 = 1,380.79 : x
2. Step 2: Convert to fraction form
   2,499.86/3,449.78 = 1,380.79/x
3. Step 3: Cross multiply
   2,499.86x = 3,449.78 × 1,380.79
4. Step 4: Simplify right side
   2,499.86x = 4,763,416.55
5. Step 5: Solve for x
   x = 4,763,416.55/2,499.86
6. Step 6: Final answer
   x = 1,905.48