Finding the Fourth Proportional to 12,123.75, 18,185.56 and 3,117.85

Step by Step Solution

1. Step 1: Write the proportion equation
   12,123.75 : 18,185.56 = 3,117.85 : x
2. Step 2: Convert to fraction form
   12,123.75/18,185.56 = 3,117.85/x
3. Step 3: Cross multiply
   12,123.75x = 18,185.56 × 3,117.85
4. Step 4: Simplify right side
   12,123.75x = 56,699,848.25
5. Step 5: Solve for x
   x = 56,699,848.25/12,123.75
6. Step 6: Final answer
   x = 4,676.76