Finding the Fourth Proportional to 2,635.92, 3,951.18 and 991.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,635.92 : 3,951.18 = 991.32 : x
2. Step 2: Convert to fraction form
   2,635.92/3,951.18 = 991.32/x
3. Step 3: Cross multiply
   2,635.92x = 3,951.18 × 991.32
4. Step 4: Simplify right side
   2,635.92x = 3,916,883.76
5. Step 5: Solve for x
   x = 3,916,883.76/2,635.92
6. Step 6: Final answer
   x = 1,485.96