Finding the Fourth Proportional to 2,778.30, 3,809.43 and 2,712.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,778.30 : 3,809.43 = 2,712.69 : x
2. Step 2: Convert to fraction form
   2,778.30/3,809.43 = 2,712.69/x
3. Step 3: Cross multiply
   2,778.30x = 3,809.43 × 2,712.69
4. Step 4: Simplify right side
   2,778.30x = 10,333,802.67
5. Step 5: Solve for x
   x = 10,333,802.67/2,778.30
6. Step 6: Final answer
   x = 3,719.47