Finding the Fourth Proportional to 71,488.14, 98,665.46 and 39,667.28

Step by Step Solution

1. Step 1: Write the proportion equation
   71,488.14 : 98,665.46 = 39,667.28 : x
2. Step 2: Convert to fraction form
   71,488.14/98,665.46 = 39,667.28/x
3. Step 3: Cross multiply
   71,488.14x = 98,665.46 × 39,667.28
4. Step 4: Simplify right side
   71,488.14x = 3,913,790,428.15
5. Step 5: Solve for x
   x = 3,913,790,428.15/71,488.14
6. Step 6: Final answer
   x = 54,747.41