Finding the Fourth Proportional to 1,917.72, 2,648.54 and 1,219.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.72 : 2,648.54 = 1,219.52 : x
2. Step 2: Convert to fraction form
   1,917.72/2,648.54 = 1,219.52/x
3. Step 3: Cross multiply
   1,917.72x = 2,648.54 × 1,219.52
4. Step 4: Simplify right side
   1,917.72x = 3,229,947.50
5. Step 5: Solve for x
   x = 3,229,947.50/1,917.72
6. Step 6: Final answer
   x = 1,684.26