Finding the Fourth Proportional to 2,664.76, 3,997.52 and 1,278.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,664.76 : 3,997.52 = 1,278.79 : x
2. Step 2: Convert to fraction form
   2,664.76/3,997.52 = 1,278.79/x
3. Step 3: Cross multiply
   2,664.76x = 3,997.52 × 1,278.79
4. Step 4: Simplify right side
   2,664.76x = 5,111,988.60
5. Step 5: Solve for x
   x = 5,111,988.60/2,664.76
6. Step 6: Final answer
   x = 1,918.37