Finding the Fourth Proportional to 1,680.31, 2,522.22 and 1,578.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.31 : 2,522.22 = 1,578.25 : x
2. Step 2: Convert to fraction form
   1,680.31/2,522.22 = 1,578.25/x
3. Step 3: Cross multiply
   1,680.31x = 2,522.22 × 1,578.25
4. Step 4: Simplify right side
   1,680.31x = 3,980,693.72
5. Step 5: Solve for x
   x = 3,980,693.72/1,680.31
6. Step 6: Final answer
   x = 2,369.02