Finding the Fourth Proportional to 1,917.96, 2,646.32 and 1,078.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.96 : 2,646.32 = 1,078.50 : x
2. Step 2: Convert to fraction form
   1,917.96/2,646.32 = 1,078.50/x
3. Step 3: Cross multiply
   1,917.96x = 2,646.32 × 1,078.50
4. Step 4: Simplify right side
   1,917.96x = 2,854,050.73
5. Step 5: Solve for x
   x = 2,854,050.73/1,917.96
6. Step 6: Final answer
   x = 1,488.07