Finding the Fourth Proportional to 12,110.78, 18,133.83 and 7,109.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,110.78 : 18,133.83 = 7,109.01 : x
2. Step 2: Convert to fraction form
   12,110.78/18,133.83 = 7,109.01/x
3. Step 3: Cross multiply
   12,110.78x = 18,133.83 × 7,109.01
4. Step 4: Simplify right side
   12,110.78x = 128,913,552.15
5. Step 5: Solve for x
   x = 128,913,552.15/12,110.78
6. Step 6: Final answer
   x = 10,644.53