Finding the Fourth Proportional to 1,422.42, 1,961.73 and 1,069.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.42 : 1,961.73 = 1,069.20 : x
2. Step 2: Convert to fraction form
   1,422.42/1,961.73 = 1,069.20/x
3. Step 3: Cross multiply
   1,422.42x = 1,961.73 × 1,069.20
4. Step 4: Simplify right side
   1,422.42x = 2,097,483.22
5. Step 5: Solve for x
   x = 2,097,483.22/1,422.42
6. Step 6: Final answer
   x = 1,474.58