Finding the Fourth Proportional to 22,978.35, 31,708.94 and 12,907.22

Step by Step Solution

1. Step 1: Write the proportion equation
   22,978.35 : 31,708.94 = 12,907.22 : x
2. Step 2: Convert to fraction form
   22,978.35/31,708.94 = 12,907.22/x
3. Step 3: Cross multiply
   22,978.35x = 31,708.94 × 12,907.22
4. Step 4: Simplify right side
   22,978.35x = 409,274,041.47
5. Step 5: Solve for x
   x = 409,274,041.47/22,978.35
6. Step 6: Final answer
   x = 17,811.29