Finding the Fourth Proportional to 39,991.62, 59,994.72 and 20,011.56

Step by Step Solution

1. Step 1: Write the proportion equation
   39,991.62 : 59,994.72 = 20,011.56 : x
2. Step 2: Convert to fraction form
   39,991.62/59,994.72 = 20,011.56/x
3. Step 3: Cross multiply
   39,991.62x = 59,994.72 × 20,011.56
4. Step 4: Simplify right side
   39,991.62x = 1,200,587,938.96
5. Step 5: Solve for x
   x = 1,200,587,938.96/39,991.62
6. Step 6: Final answer
   x = 30,020.99