Finding the Fourth Proportional to 1,917.59, 2,645.98 and 1,078.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.59 : 2,645.98 = 1,078.17 : x
2. Step 2: Convert to fraction form
   1,917.59/2,645.98 = 1,078.17/x
3. Step 3: Cross multiply
   1,917.59x = 2,645.98 × 1,078.17
4. Step 4: Simplify right side
   1,917.59x = 2,852,816.26
5. Step 5: Solve for x
   x = 2,852,816.26/1,917.59
6. Step 6: Final answer
   x = 1,487.71