Finding the Fourth Proportional to 12,047.31, 18,072.66 and 3,728.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,047.31 : 18,072.66 = 3,728.07 : x
2. Step 2: Convert to fraction form
   12,047.31/18,072.66 = 3,728.07/x
3. Step 3: Cross multiply
   12,047.31x = 18,072.66 × 3,728.07
4. Step 4: Simplify right side
   12,047.31x = 67,376,141.57
5. Step 5: Solve for x
   x = 67,376,141.57/12,047.31
6. Step 6: Final answer
   x = 5,592.63