Finding the Fourth Proportional to 12,100.72, 18,145.08 and 7,104.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,100.72 : 18,145.08 = 7,104.28 : x
2. Step 2: Convert to fraction form
   12,100.72/18,145.08 = 7,104.28/x
3. Step 3: Cross multiply
   12,100.72x = 18,145.08 × 7,104.28
4. Step 4: Simplify right side
   12,100.72x = 128,907,728.94
5. Step 5: Solve for x
   x = 128,907,728.94/12,100.72
6. Step 6: Final answer
   x = 10,652.90