Finding the Fourth Proportional to 10,641.88, 15,979.08 and 5,721.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,641.88 : 15,979.08 = 5,721.10 : x
2. Step 2: Convert to fraction form
   10,641.88/15,979.08 = 5,721.10/x
3. Step 3: Cross multiply
   10,641.88x = 15,979.08 × 5,721.10
4. Step 4: Simplify right side
   10,641.88x = 91,417,914.59
5. Step 5: Solve for x
   x = 91,417,914.59/10,641.88
6. Step 6: Final answer
   x = 8,590.39