Finding the Fourth Proportional to 9,721.12, 14,590.32 and 3,889.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,721.12 : 14,590.32 = 3,889.12 : x
2. Step 2: Convert to fraction form
   9,721.12/14,590.32 = 3,889.12/x
3. Step 3: Cross multiply
   9,721.12x = 14,590.32 × 3,889.12
4. Step 4: Simplify right side
   9,721.12x = 56,743,505.32
5. Step 5: Solve for x
   x = 56,743,505.32/9,721.12
6. Step 6: Final answer
   x = 5,837.14