Finding the Fourth Proportional to 12,123.79, 18,185.99 and 3,358.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,123.79 : 18,185.99 = 3,358.78 : x
2. Step 2: Convert to fraction form
   12,123.79/18,185.99 = 3,358.78/x
3. Step 3: Cross multiply
   12,123.79x = 18,185.99 × 3,358.78
4. Step 4: Simplify right side
   12,123.79x = 61,082,677.23
5. Step 5: Solve for x
   x = 61,082,677.23/12,123.79
6. Step 6: Final answer
   x = 5,038.25