Finding the Fourth Proportional to 1,686.17, 2,327.04 and 978.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.17 : 2,327.04 = 978.23 : x
2. Step 2: Convert to fraction form
   1,686.17/2,327.04 = 978.23/x
3. Step 3: Cross multiply
   1,686.17x = 2,327.04 × 978.23
4. Step 4: Simplify right side
   1,686.17x = 2,276,380.34
5. Step 5: Solve for x
   x = 2,276,380.34/1,686.17
6. Step 6: Final answer
   x = 1,350.03