Finding the Fourth Proportional to 22,971.12, 31,697.72 and 12,900.68

Step by Step Solution

1. Step 1: Write the proportion equation
   22,971.12 : 31,697.72 = 12,900.68 : x
2. Step 2: Convert to fraction form
   22,971.12/31,697.72 = 12,900.68/x
3. Step 3: Cross multiply
   22,971.12x = 31,697.72 × 12,900.68
4. Step 4: Simplify right side
   22,971.12x = 408,922,142.45
5. Step 5: Solve for x
   x = 408,922,142.45/22,971.12
6. Step 6: Final answer
   x = 17,801.58