Finding the Fourth Proportional to 1,965.78, 2,712.61 and 1,158.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,965.78 : 2,712.61 = 1,158.10 : x
2. Step 2: Convert to fraction form
   1,965.78/2,712.61 = 1,158.10/x
3. Step 3: Cross multiply
   1,965.78x = 2,712.61 × 1,158.10
4. Step 4: Simplify right side
   1,965.78x = 3,141,481.40
5. Step 5: Solve for x
   x = 3,141,481.40/1,965.78
6. Step 6: Final answer
   x = 1,598.08