Finding the Fourth Proportional to 28,697.31, 39,621.42 and 17,958.51

Step by Step Solution

1. Step 1: Write the proportion equation
   28,697.31 : 39,621.42 = 17,958.51 : x
2. Step 2: Convert to fraction form
   28,697.31/39,621.42 = 17,958.51/x
3. Step 3: Cross multiply
   28,697.31x = 39,621.42 × 17,958.51
4. Step 4: Simplify right side
   28,697.31x = 711,541,667.28
5. Step 5: Solve for x
   x = 711,541,667.28/28,697.31
6. Step 6: Final answer
   x = 24,794.72