Finding the Fourth Proportional to 8,120.57, 12,157.10 and 7,342.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,120.57 : 12,157.10 = 7,342.37 : x
2. Step 2: Convert to fraction form
   8,120.57/12,157.10 = 7,342.37/x
3. Step 3: Cross multiply
   8,120.57x = 12,157.10 × 7,342.37
4. Step 4: Simplify right side
   8,120.57x = 89,261,828.83
5. Step 5: Solve for x
   x = 89,261,828.83/8,120.57
6. Step 6: Final answer
   x = 10,992.06