Finding the Fourth Proportional to 2,165.78, 2,989.98 and 1,370.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.78 : 2,989.98 = 1,370.16 : x
2. Step 2: Convert to fraction form
   2,165.78/2,989.98 = 1,370.16/x
3. Step 3: Cross multiply
   2,165.78x = 2,989.98 × 1,370.16
4. Step 4: Simplify right side
   2,165.78x = 4,096,751.00
5. Step 5: Solve for x
   x = 4,096,751.00/2,165.78
6. Step 6: Final answer
   x = 1,891.58