Finding the Fourth Proportional to 1,919.74, 2,650.78 and 1,247.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.74 : 2,650.78 = 1,247.88 : x
2. Step 2: Convert to fraction form
   1,919.74/2,650.78 = 1,247.88/x
3. Step 3: Cross multiply
   1,919.74x = 2,650.78 × 1,247.88
4. Step 4: Simplify right side
   1,919.74x = 3,307,848.72
5. Step 5: Solve for x
   x = 3,307,848.72/1,919.74
6. Step 6: Final answer
   x = 1,723.07