Finding the Fourth Proportional to 10,131.78, 13,987.67 and 7,722.84

Step by Step Solution

1. Step 1: Write the proportion equation
   10,131.78 : 13,987.67 = 7,722.84 : x
2. Step 2: Convert to fraction form
   10,131.78/13,987.67 = 7,722.84/x
3. Step 3: Cross multiply
   10,131.78x = 13,987.67 × 7,722.84
4. Step 4: Simplify right side
   10,131.78x = 108,024,537.38
5. Step 5: Solve for x
   x = 108,024,537.38/10,131.78
6. Step 6: Final answer
   x = 10,661.95