Finding the Fourth Proportional to 12,100.50, 18,138.60 and 7,410.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,100.50 : 18,138.60 = 7,410.60 : x
2. Step 2: Convert to fraction form
   12,100.50/18,138.60 = 7,410.60/x
3. Step 3: Cross multiply
   12,100.50x = 18,138.60 × 7,410.60
4. Step 4: Simplify right side
   12,100.50x = 134,417,909.16
5. Step 5: Solve for x
   x = 134,417,909.16/12,100.50
6. Step 6: Final answer
   x = 11,108.46