Finding the Fourth Proportional to 42,168.23, 58,239.98 and 28,716.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,168.23 : 58,239.98 = 28,716.12 : x
2. Step 2: Convert to fraction form
   42,168.23/58,239.98 = 28,716.12/x
3. Step 3: Cross multiply
   42,168.23x = 58,239.98 × 28,716.12
4. Step 4: Simplify right side
   42,168.23x = 1,672,426,218.58
5. Step 5: Solve for x
   x = 1,672,426,218.58/42,168.23
6. Step 6: Final answer
   x = 39,660.81