Finding the Fourth Proportional to 12,242.05, 18,345.89 and 5,212.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,242.05 : 18,345.89 = 5,212.55 : x
2. Step 2: Convert to fraction form
   12,242.05/18,345.89 = 5,212.55/x
3. Step 3: Cross multiply
   12,242.05x = 18,345.89 × 5,212.55
4. Step 4: Simplify right side
   12,242.05x = 95,628,927.82
5. Step 5: Solve for x
   x = 95,628,927.82/12,242.05
6. Step 6: Final answer
   x = 7,811.51