Finding the Fourth Proportional to 42,986.78, 59,306.55 and 28,091.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,986.78 : 59,306.55 = 28,091.42 : x
2. Step 2: Convert to fraction form
   42,986.78/59,306.55 = 28,091.42/x
3. Step 3: Cross multiply
   42,986.78x = 59,306.55 × 28,091.42
4. Step 4: Simplify right side
   42,986.78x = 1,666,005,204.80
5. Step 5: Solve for x
   x = 1,666,005,204.80/42,986.78
6. Step 6: Final answer
   x = 38,756.22