Finding the Fourth Proportional to 42,216.72, 58,282.44 and 28,807.92

Step by Step Solution

1. Step 1: Write the proportion equation
   42,216.72 : 58,282.44 = 28,807.92 : x
2. Step 2: Convert to fraction form
   42,216.72/58,282.44 = 28,807.92/x
3. Step 3: Cross multiply
   42,216.72x = 58,282.44 × 28,807.92
4. Step 4: Simplify right side
   42,216.72x = 1,678,995,868.92
5. Step 5: Solve for x
   x = 1,678,995,868.92/42,216.72
6. Step 6: Final answer
   x = 39,770.87