Finding the Fourth Proportional to 12,777.21, 17,632.42 and 7,111.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,777.21 : 17,632.42 = 7,111.88 : x
2. Step 2: Convert to fraction form
   12,777.21/17,632.42 = 7,111.88/x
3. Step 3: Cross multiply
   12,777.21x = 17,632.42 × 7,111.88
4. Step 4: Simplify right side
   12,777.21x = 125,399,655.15
5. Step 5: Solve for x
   x = 125,399,655.15/12,777.21
6. Step 6: Final answer
   x = 9,814.32