Finding the Fourth Proportional to 91,306.20, 136,957.38 and 42,058.20

Step by Step Solution

1. Step 1: Write the proportion equation
   91,306.20 : 136,957.38 = 42,058.20 : x
2. Step 2: Convert to fraction form
   91,306.20/136,957.38 = 42,058.20/x
3. Step 3: Cross multiply
   91,306.20x = 136,957.38 × 42,058.20
4. Step 4: Simplify right side
   91,306.20x = 5,760,180,879.52
5. Step 5: Solve for x
   x = 5,760,180,879.52/91,306.20
6. Step 6: Final answer
   x = 63,086.42