Finding the Fourth Proportional to 2,172.42, 2,997.12 and 1,426.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.42 : 2,997.12 = 1,426.79 : x
2. Step 2: Convert to fraction form
   2,172.42/2,997.12 = 1,426.79/x
3. Step 3: Cross multiply
   2,172.42x = 2,997.12 × 1,426.79
4. Step 4: Simplify right side
   2,172.42x = 4,276,245.86
5. Step 5: Solve for x
   x = 4,276,245.86/2,172.42
6. Step 6: Final answer
   x = 1,968.43