Finding the Fourth Proportional to 99,821, 149,795.72 and 39,839.20

Step by Step Solution

1. Step 1: Write the proportion equation
   99,821 : 149,795.72 = 39,839.20 : x
2. Step 2: Convert to fraction form
   99,821/149,795.72 = 39,839.20/x
3. Step 3: Cross multiply
   99,821x = 149,795.72 × 39,839.20
4. Step 4: Simplify right side
   99,821x = 5,967,741,648.22
5. Step 5: Solve for x
   x = 5,967,741,648.22/99,821
6. Step 6: Final answer
   x = 59,784.43