Finding the Fourth Proportional to 12,061, 18,069 and 7,115.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,061 : 18,069 = 7,115.95 : x
2. Step 2: Convert to fraction form
   12,061/18,069 = 7,115.95/x
3. Step 3: Cross multiply
   12,061x = 18,069 × 7,115.95
4. Step 4: Simplify right side
   12,061x = 128,578,100.55
5. Step 5: Solve for x
   x = 128,578,100.55/12,061
6. Step 6: Final answer
   x = 10,660.65