Finding the Fourth Proportional to 42,311.20, 58,408.40 and 30,432.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,311.20 : 58,408.40 = 30,432.80 : x
2. Step 2: Convert to fraction form
   42,311.20/58,408.40 = 30,432.80/x
3. Step 3: Cross multiply
   42,311.20x = 58,408.40 × 30,432.80
4. Step 4: Simplify right side
   42,311.20x = 1,777,531,155.52
5. Step 5: Solve for x
   x = 1,777,531,155.52/42,311.20
6. Step 6: Final answer
   x = 42,010.89