Finding the Fourth Proportional to 1,917.89, 2,646.51 and 1,078.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.89 : 2,646.51 = 1,078.63 : x
2. Step 2: Convert to fraction form
   1,917.89/2,646.51 = 1,078.63/x
3. Step 3: Cross multiply
   1,917.89x = 2,646.51 × 1,078.63
4. Step 4: Simplify right side
   1,917.89x = 2,854,607.78
5. Step 5: Solve for x
   x = 2,854,607.78/1,917.89
6. Step 6: Final answer
   x = 1,488.41