Finding the Fourth Proportional to 20,738.42, 31,107.75 and 5,156.05

Step by Step Solution

1. Step 1: Write the proportion equation
   20,738.42 : 31,107.75 = 5,156.05 : x
2. Step 2: Convert to fraction form
   20,738.42/31,107.75 = 5,156.05/x
3. Step 3: Cross multiply
   20,738.42x = 31,107.75 × 5,156.05
4. Step 4: Simplify right side
   20,738.42x = 160,393,114.39
5. Step 5: Solve for x
   x = 160,393,114.39/20,738.42
6. Step 6: Final answer
   x = 7,734.10