Finding the Fourth Proportional to 1,995.48, 2,978.96 and 1,685.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,995.48 : 2,978.96 = 1,685.16 : x
2. Step 2: Convert to fraction form
   1,995.48/2,978.96 = 1,685.16/x
3. Step 3: Cross multiply
   1,995.48x = 2,978.96 × 1,685.16
4. Step 4: Simplify right side
   1,995.48x = 5,020,015.81
5. Step 5: Solve for x
   x = 5,020,015.81/1,995.48
6. Step 6: Final answer
   x = 2,515.69