Finding the Fourth Proportional to 9,189.14, 12,688.16 and 7,061.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,189.14 : 12,688.16 = 7,061.31 : x
2. Step 2: Convert to fraction form
   9,189.14/12,688.16 = 7,061.31/x
3. Step 3: Cross multiply
   9,189.14x = 12,688.16 × 7,061.31
4. Step 4: Simplify right side
   9,189.14x = 89,594,995.78
5. Step 5: Solve for x
   x = 89,594,995.78/9,189.14
6. Step 6: Final answer
   x = 9,750.10