Finding the Fourth Proportional to 1,980.12, 2,969.76 and 1,248.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.12 : 2,969.76 = 1,248.72 : x
2. Step 2: Convert to fraction form
   1,980.12/2,969.76 = 1,248.72/x
3. Step 3: Cross multiply
   1,980.12x = 2,969.76 × 1,248.72
4. Step 4: Simplify right side
   1,980.12x = 3,708,398.71
5. Step 5: Solve for x
   x = 3,708,398.71/1,980.12
6. Step 6: Final answer
   x = 1,872.82