Finding the Fourth Proportional to 1,980.88, 2,971.62 and 682.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.88 : 2,971.62 = 682.72 : x
2. Step 2: Convert to fraction form
   1,980.88/2,971.62 = 682.72/x
3. Step 3: Cross multiply
   1,980.88x = 2,971.62 × 682.72
4. Step 4: Simplify right side
   1,980.88x = 2,028,784.41
5. Step 5: Solve for x
   x = 2,028,784.41/1,980.88
6. Step 6: Final answer
   x = 1,024.18