Finding the Fourth Proportional to 85,343,472.15, 128,015,540.37 and 20,647,173.42

Step by Step Solution

1. Step 1: Write the proportion equation
   85,343,472.15 : 128,015,540.37 = 20,647,173.42 : x
2. Step 2: Convert to fraction form
   85,343,472.15/128,015,540.37 = 20,647,173.42/x
3. Step 3: Cross multiply
   85,343,472.15x = 128,015,540.37 × 20,647,173.42
4. Step 4: Simplify right side
   85,343,472.15x = 2,643,159,062,474,401.50
5. Step 5: Solve for x
   x = 2,643,159,062,474,401.50/85,343,472.15
6. Step 6: Final answer
   x = 30,970,840.49