Finding the Fourth Proportional to 9,721.90, 14,585.18 and 3,148.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,721.90 : 14,585.18 = 3,148.09 : x
2. Step 2: Convert to fraction form
   9,721.90/14,585.18 = 3,148.09/x
3. Step 3: Cross multiply
   9,721.90x = 14,585.18 × 3,148.09
4. Step 4: Simplify right side
   9,721.90x = 45,915,443.57
5. Step 5: Solve for x
   x = 45,915,443.57/9,721.90
6. Step 6: Final answer
   x = 4,722.89