Finding the Fourth Proportional to 12,018.29, 16,561.61 and 9,188.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,018.29 : 16,561.61 = 9,188.86 : x
2. Step 2: Convert to fraction form
   12,018.29/16,561.61 = 9,188.86/x
3. Step 3: Cross multiply
   12,018.29x = 16,561.61 × 9,188.86
4. Step 4: Simplify right side
   12,018.29x = 152,182,228.32
5. Step 5: Solve for x
   x = 152,182,228.32/12,018.29
6. Step 6: Final answer
   x = 12,662.56