Finding the Fourth Proportional to 12,123, 18,185.31 and 5,197.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,123 : 18,185.31 = 5,197.50 : x
2. Step 2: Convert to fraction form
   12,123/18,185.31 = 5,197.50/x
3. Step 3: Cross multiply
   12,123x = 18,185.31 × 5,197.50
4. Step 4: Simplify right side
   12,123x = 94,518,148.73
5. Step 5: Solve for x
   x = 94,518,148.73/12,123
6. Step 6: Final answer
   x = 7,796.60