Finding the Fourth Proportional to 80,736.63, 120,874.50 and 64,120.29

Step by Step Solution

1. Step 1: Write the proportion equation
   80,736.63 : 120,874.50 = 64,120.29 : x
2. Step 2: Convert to fraction form
   80,736.63/120,874.50 = 64,120.29/x
3. Step 3: Cross multiply
   80,736.63x = 120,874.50 × 64,120.29
4. Step 4: Simplify right side
   80,736.63x = 7,750,507,993.61
5. Step 5: Solve for x
   x = 7,750,507,993.61/80,736.63
6. Step 6: Final answer
   x = 95,997.42