Finding the Fourth Proportional to 1,086.98, 1,620.16 and 1,078.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.98 : 1,620.16 = 1,078.48 : x
2. Step 2: Convert to fraction form
   1,086.98/1,620.16 = 1,078.48/x
3. Step 3: Cross multiply
   1,086.98x = 1,620.16 × 1,078.48
4. Step 4: Simplify right side
   1,086.98x = 1,747,302.06
5. Step 5: Solve for x
   x = 1,747,302.06/1,086.98
6. Step 6: Final answer
   x = 1,607.48