Finding the Fourth Proportional to 28,429.39, 42,614.30 and 15,931.09

Step by Step Solution

1. Step 1: Write the proportion equation
   28,429.39 : 42,614.30 = 15,931.09 : x
2. Step 2: Convert to fraction form
   28,429.39/42,614.30 = 15,931.09/x
3. Step 3: Cross multiply
   28,429.39x = 42,614.30 × 15,931.09
4. Step 4: Simplify right side
   28,429.39x = 678,892,168.93
5. Step 5: Solve for x
   x = 678,892,168.93/28,429.39
6. Step 6: Final answer
   x = 23,879.94