Finding the Fourth Proportional to 20,740.73, 31,111.20 and 5,158.35

Step by Step Solution

1. Step 1: Write the proportion equation
   20,740.73 : 31,111.20 = 5,158.35 : x
2. Step 2: Convert to fraction form
   20,740.73/31,111.20 = 5,158.35/x
3. Step 3: Cross multiply
   20,740.73x = 31,111.20 × 5,158.35
4. Step 4: Simplify right side
   20,740.73x = 160,482,458.52
5. Step 5: Solve for x
   x = 160,482,458.52/20,740.73
6. Step 6: Final answer
   x = 7,737.55