Finding the Fourth Proportional to 2,016.60, 2,784.12 and 1,308.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016.60 : 2,784.12 = 1,308.72 : x
2. Step 2: Convert to fraction form
   2,016.60/2,784.12 = 1,308.72/x
3. Step 3: Cross multiply
   2,016.60x = 2,784.12 × 1,308.72
4. Step 4: Simplify right side
   2,016.60x = 3,643,633.53
5. Step 5: Solve for x
   x = 3,643,633.53/2,016.60
6. Step 6: Final answer
   x = 1,806.82