Finding the Fourth Proportional to 10,993.56, 16,488.51 and 3,972.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,993.56 : 16,488.51 = 3,972.21 : x
2. Step 2: Convert to fraction form
   10,993.56/16,488.51 = 3,972.21/x
3. Step 3: Cross multiply
   10,993.56x = 16,488.51 × 3,972.21
4. Step 4: Simplify right side
   10,993.56x = 65,495,824.31
5. Step 5: Solve for x
   x = 65,495,824.31/10,993.56
6. Step 6: Final answer
   x = 5,957.65