Finding the Fourth Proportional to 22,978.80, 31,708.14 and 12,905.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,978.80 : 31,708.14 = 12,905.88 : x
2. Step 2: Convert to fraction form
   22,978.80/31,708.14 = 12,905.88/x
3. Step 3: Cross multiply
   22,978.80x = 31,708.14 × 12,905.88
4. Step 4: Simplify right side
   22,978.80x = 409,221,449.86
5. Step 5: Solve for x
   x = 409,221,449.86/22,978.80
6. Step 6: Final answer
   x = 17,808.65