Finding the Fourth Proportional to 42,722.15, 58,938.49 and 28,579.55

Step by Step Solution

1. Step 1: Write the proportion equation
   42,722.15 : 58,938.49 = 28,579.55 : x
2. Step 2: Convert to fraction form
   42,722.15/58,938.49 = 28,579.55/x
3. Step 3: Cross multiply
   42,722.15x = 58,938.49 × 28,579.55
4. Step 4: Simplify right side
   42,722.15x = 1,684,435,597.78
5. Step 5: Solve for x
   x = 1,684,435,597.78/42,722.15
6. Step 6: Final answer
   x = 39,427.69