Finding the Fourth Proportional to 22,958.64, 31,680.24 and 12,884.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,958.64 : 31,680.24 = 12,884.88 : x
2. Step 2: Convert to fraction form
   22,958.64/31,680.24 = 12,884.88/x
3. Step 3: Cross multiply
   22,958.64x = 31,680.24 × 12,884.88
4. Step 4: Simplify right side
   22,958.64x = 408,196,090.77
5. Step 5: Solve for x
   x = 408,196,090.77/22,958.64
6. Step 6: Final answer
   x = 17,779.63