Finding the Fourth Proportional to 1,680.50, 2,520.09 and 987.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.50 : 2,520.09 = 987.34 : x
2. Step 2: Convert to fraction form
   1,680.50/2,520.09 = 987.34/x
3. Step 3: Cross multiply
   1,680.50x = 2,520.09 × 987.34
4. Step 4: Simplify right side
   1,680.50x = 2,488,185.66
5. Step 5: Solve for x
   x = 2,488,185.66/1,680.50
6. Step 6: Final answer
   x = 1,480.62