Finding the Fourth Proportional to 20,795.05, 31,131.15 and 13,377.61

Step by Step Solution

1. Step 1: Write the proportion equation
   20,795.05 : 31,131.15 = 13,377.61 : x
2. Step 2: Convert to fraction form
   20,795.05/31,131.15 = 13,377.61/x
3. Step 3: Cross multiply
   20,795.05x = 31,131.15 × 13,377.61
4. Step 4: Simplify right side
   20,795.05x = 416,460,383.55
5. Step 5: Solve for x
   x = 416,460,383.55/20,795.05
6. Step 6: Final answer
   x = 20,026.90