Finding the Fourth Proportional to 6,991.56, 9,645.48 and 4,158.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,991.56 : 9,645.48 = 4,158.72 : x
2. Step 2: Convert to fraction form
   6,991.56/9,645.48 = 4,158.72/x
3. Step 3: Cross multiply
   6,991.56x = 9,645.48 × 4,158.72
4. Step 4: Simplify right side
   6,991.56x = 40,112,850.59
5. Step 5: Solve for x
   x = 40,112,850.59/6,991.56
6. Step 6: Final answer
   x = 5,737.32