Finding the Fourth Proportional to 1,680.76, 2,517.90 and 1,372.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.76 : 2,517.90 = 1,372.96 : x
2. Step 2: Convert to fraction form
   1,680.76/2,517.90 = 1,372.96/x
3. Step 3: Cross multiply
   1,680.76x = 2,517.90 × 1,372.96
4. Step 4: Simplify right side
   1,680.76x = 3,456,975.98
5. Step 5: Solve for x
   x = 3,456,975.98/1,680.76
6. Step 6: Final answer
   x = 2,056.79