Finding the Fourth Proportional to 2,617.79, 3,612.57 and 1,422.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.79 : 3,612.57 = 1,422.78 : x
2. Step 2: Convert to fraction form
   2,617.79/3,612.57 = 1,422.78/x
3. Step 3: Cross multiply
   2,617.79x = 3,612.57 × 1,422.78
4. Step 4: Simplify right side
   2,617.79x = 5,139,892.34
5. Step 5: Solve for x
   x = 5,139,892.34/2,617.79
6. Step 6: Final answer
   x = 1,963.45