Finding the Fourth Proportional to 15,739.89, 21,724.74 and 9,776.06

Step by Step Solution

1. Step 1: Write the proportion equation
   15,739.89 : 21,724.74 = 9,776.06 : x
2. Step 2: Convert to fraction form
   15,739.89/21,724.74 = 9,776.06/x
3. Step 3: Cross multiply
   15,739.89x = 21,724.74 × 9,776.06
4. Step 4: Simplify right side
   15,739.89x = 212,382,361.72
5. Step 5: Solve for x
   x = 212,382,361.72/15,739.89
6. Step 6: Final answer
   x = 13,493.26