Finding the Fourth Proportional to 9,595.12, 13,154.90 and 9,420.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,595.12 : 13,154.90 = 9,420.16 : x
2. Step 2: Convert to fraction form
   9,595.12/13,154.90 = 9,420.16/x
3. Step 3: Cross multiply
   9,595.12x = 13,154.90 × 9,420.16
4. Step 4: Simplify right side
   9,595.12x = 123,921,262.78
5. Step 5: Solve for x
   x = 123,921,262.78/9,595.12
6. Step 6: Final answer
   x = 12,915.03