Finding the Fourth Proportional to 1,422.72, 1,964.32 and 891.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.72 : 1,964.32 = 891.82 : x
2. Step 2: Convert to fraction form
   1,422.72/1,964.32 = 891.82/x
3. Step 3: Cross multiply
   1,422.72x = 1,964.32 × 891.82
4. Step 4: Simplify right side
   1,422.72x = 1,751,819.86
5. Step 5: Solve for x
   x = 1,751,819.86/1,422.72
6. Step 6: Final answer
   x = 1,231.32