Finding the Fourth Proportional to 1,980.30, 2,970.52 and 681.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.30 : 2,970.52 = 681.76 : x
2. Step 2: Convert to fraction form
   1,980.30/2,970.52 = 681.76/x
3. Step 3: Cross multiply
   1,980.30x = 2,970.52 × 681.76
4. Step 4: Simplify right side
   1,980.30x = 2,025,181.72
5. Step 5: Solve for x
   x = 2,025,181.72/1,980.30
6. Step 6: Final answer
   x = 1,022.66