Finding the Fourth Proportional to 12,061.91, 18,108.36 and 9,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,061.91 : 18,108.36 = 9,290.50 : x
2. Step 2: Convert to fraction form
   12,061.91/18,108.36 = 9,290.50/x
3. Step 3: Cross multiply
   12,061.91x = 18,108.36 × 9,290.50
4. Step 4: Simplify right side
   12,061.91x = 168,235,673.31
5. Step 5: Solve for x
   x = 168,235,673.31/12,061.91
6. Step 6: Final answer
   x = 13,947.68