Finding the Fourth Proportional to 22,499.07, 31,054.71 and 12,939.99

Step by Step Solution

1. Step 1: Write the proportion equation
   22,499.07 : 31,054.71 = 12,939.99 : x
2. Step 2: Convert to fraction form
   22,499.07/31,054.71 = 12,939.99/x
3. Step 3: Cross multiply
   22,499.07x = 31,054.71 × 12,939.99
4. Step 4: Simplify right side
   22,499.07x = 401,847,481.58
5. Step 5: Solve for x
   x = 401,847,481.58/22,499.07
6. Step 6: Final answer
   x = 17,860.63