Finding the Fourth Proportional to 12,105.55, 18,137.82 and 7,415.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,105.55 : 18,137.82 = 7,415.75 : x
2. Step 2: Convert to fraction form
   12,105.55/18,137.82 = 7,415.75/x
3. Step 3: Cross multiply
   12,105.55x = 18,137.82 × 7,415.75
4. Step 4: Simplify right side
   12,105.55x = 134,505,611.82
5. Step 5: Solve for x
   x = 134,505,611.82/12,105.55
6. Step 6: Final answer
   x = 11,111.07