Finding the Fourth Proportional to 10,867.79, 14,997.89 and 7,638.05

Step by Step Solution

1. Step 1: Write the proportion equation
   10,867.79 : 14,997.89 = 7,638.05 : x
2. Step 2: Convert to fraction form
   10,867.79/14,997.89 = 7,638.05/x
3. Step 3: Cross multiply
   10,867.79x = 14,997.89 × 7,638.05
4. Step 4: Simplify right side
   10,867.79x = 114,554,633.71
5. Step 5: Solve for x
   x = 114,554,633.71/10,867.79
6. Step 6: Final answer
   x = 10,540.75