Finding the Fourth Proportional to 1,422.42, 1,959 and 1,225.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.42 : 1,959 = 1,225.86 : x
2. Step 2: Convert to fraction form
   1,422.42/1,959 = 1,225.86/x
3. Step 3: Cross multiply
   1,422.42x = 1,959 × 1,225.86
4. Step 4: Simplify right side
   1,422.42x = 2,401,459.74
5. Step 5: Solve for x
   x = 2,401,459.74/1,422.42
6. Step 6: Final answer
   x = 1,688.29