Finding the Fourth Proportional to 12,072.88, 18,109.28 and 3,307.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,072.88 : 18,109.28 = 3,307.86 : x
2. Step 2: Convert to fraction form
   12,072.88/18,109.28 = 3,307.86/x
3. Step 3: Cross multiply
   12,072.88x = 18,109.28 × 3,307.86
4. Step 4: Simplify right side
   12,072.88x = 59,902,962.94
5. Step 5: Solve for x
   x = 59,902,962.94/12,072.88
6. Step 6: Final answer
   x = 4,961.78