Finding the Fourth Proportional to 7,992.47, 12,031.89 and 7,188.75

Step by Step Solution

1. Step 1: Write the proportion equation
   7,992.47 : 12,031.89 = 7,188.75 : x
2. Step 2: Convert to fraction form
   7,992.47/12,031.89 = 7,188.75/x
3. Step 3: Cross multiply
   7,992.47x = 12,031.89 × 7,188.75
4. Step 4: Simplify right side
   7,992.47x = 86,494,262.72
5. Step 5: Solve for x
   x = 86,494,262.72/7,992.47
6. Step 6: Final answer
   x = 10,821.97