Finding the Fourth Proportional to 12,056.72, 18,082.64 and 3,290.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,056.72 : 18,082.64 = 3,290.90 : x
2. Step 2: Convert to fraction form
   12,056.72/18,082.64 = 3,290.90/x
3. Step 3: Cross multiply
   12,056.72x = 18,082.64 × 3,290.90
4. Step 4: Simplify right side
   12,056.72x = 59,508,159.98
5. Step 5: Solve for x
   x = 59,508,159.98/12,056.72
6. Step 6: Final answer
   x = 4,935.68