Finding the Fourth Proportional to 1,205.52, 1,665.18 and 891.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,205.52 : 1,665.18 = 891.42 : x
2. Step 2: Convert to fraction form
   1,205.52/1,665.18 = 891.42/x
3. Step 3: Cross multiply
   1,205.52x = 1,665.18 × 891.42
4. Step 4: Simplify right side
   1,205.52x = 1,484,374.76
5. Step 5: Solve for x
   x = 1,484,374.76/1,205.52
6. Step 6: Final answer
   x = 1,231.31