Finding the Fourth Proportional to 12,121, 18,171.64 and 5,200.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,121 : 18,171.64 = 5,200.36 : x
2. Step 2: Convert to fraction form
   12,121/18,171.64 = 5,200.36/x
3. Step 3: Cross multiply
   12,121x = 18,171.64 × 5,200.36
4. Step 4: Simplify right side
   12,121x = 94,499,069.79
5. Step 5: Solve for x
   x = 94,499,069.79/12,121
6. Step 6: Final answer
   x = 7,796.31