Finding the Fourth Proportional to 1,422.72, 1,964.31 and 1,090.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.72 : 1,964.31 = 1,090.56 : x
2. Step 2: Convert to fraction form
   1,422.72/1,964.31 = 1,090.56/x
3. Step 3: Cross multiply
   1,422.72x = 1,964.31 × 1,090.56
4. Step 4: Simplify right side
   1,422.72x = 2,142,197.91
5. Step 5: Solve for x
   x = 2,142,197.91/1,422.72
6. Step 6: Final answer
   x = 1,505.71