Finding the Fourth Proportional to 9,131.12, 12,589.52 and 7,620.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,131.12 : 12,589.52 = 7,620.86 : x
2. Step 2: Convert to fraction form
   9,131.12/12,589.52 = 7,620.86/x
3. Step 3: Cross multiply
   9,131.12x = 12,589.52 × 7,620.86
4. Step 4: Simplify right side
   9,131.12x = 95,942,969.39
5. Step 5: Solve for x
   x = 95,942,969.39/9,131.12
6. Step 6: Final answer
   x = 10,507.25