Finding the Fourth Proportional to 2,039.72, 3,060.94 and 1,309.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.72 : 3,060.94 = 1,309.80 : x
2. Step 2: Convert to fraction form
   2,039.72/3,060.94 = 1,309.80/x
3. Step 3: Cross multiply
   2,039.72x = 3,060.94 × 1,309.80
4. Step 4: Simplify right side
   2,039.72x = 4,009,227.42
5. Step 5: Solve for x
   x = 4,009,227.42/2,039.72
6. Step 6: Final answer
   x = 1,965.58