Finding the Fourth Proportional to 1,442.34, 1,991.52 and 911.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.34 : 1,991.52 = 911.39 : x
2. Step 2: Convert to fraction form
   1,442.34/1,991.52 = 911.39/x
3. Step 3: Cross multiply
   1,442.34x = 1,991.52 × 911.39
4. Step 4: Simplify right side
   1,442.34x = 1,815,041.46
5. Step 5: Solve for x
   x = 1,815,041.46/1,442.34
6. Step 6: Final answer
   x = 1,258.40