Finding the Fourth Proportional to 85,343,469.82, 128,015,536.86 and 20,647,171.06

Step by Step Solution

1. Step 1: Write the proportion equation
   85,343,469.82 : 128,015,536.86 = 20,647,171.06 : x
2. Step 2: Convert to fraction form
   85,343,469.82/128,015,536.86 = 20,647,171.06/x
3. Step 3: Cross multiply
   85,343,469.82x = 128,015,536.86 × 20,647,171.06
4. Step 4: Simplify right side
   85,343,469.82x = 2,643,158,687,886,155
5. Step 5: Solve for x
   x = 2,643,158,687,886,155/85,343,469.82
6. Step 6: Final answer
   x = 30,970,836.94