Finding the Fourth Proportional to 20,718.18, 31,077.59 and 5,135.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,718.18 : 31,077.59 = 5,135.82 : x
2. Step 2: Convert to fraction form
   20,718.18/31,077.59 = 5,135.82/x
3. Step 3: Cross multiply
   20,718.18x = 31,077.59 × 5,135.82
4. Step 4: Simplify right side
   20,718.18x = 159,608,908.27
5. Step 5: Solve for x
   x = 159,608,908.27/20,718.18
6. Step 6: Final answer
   x = 7,703.81