Finding the Fourth Proportional to 3,945.60, 5,915.52 and 1,998.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945.60 : 5,915.52 = 1,998.72 : x
2. Step 2: Convert to fraction form
   3,945.60/5,915.52 = 1,998.72/x
3. Step 3: Cross multiply
   3,945.60x = 5,915.52 × 1,998.72
4. Step 4: Simplify right side
   3,945.60x = 11,823,468.13
5. Step 5: Solve for x
   x = 11,823,468.13/3,945.60
6. Step 6: Final answer
   x = 2,996.62