Finding the Fourth Proportional to 1,680.10, 2,522.55 and 1,315.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.10 : 2,522.55 = 1,315.30 : x
2. Step 2: Convert to fraction form
   1,680.10/2,522.55 = 1,315.30/x
3. Step 3: Cross multiply
   1,680.10x = 2,522.55 × 1,315.30
4. Step 4: Simplify right side
   1,680.10x = 3,317,910.02
5. Step 5: Solve for x
   x = 3,317,910.02/1,680.10
6. Step 6: Final answer
   x = 1,974.83