Finding the Fourth Proportional to 20,781.32, 31,172.00 and 5,198.94

Step by Step Solution

1. Step 1: Write the proportion equation
   20,781.32 : 31,172.00 = 5,198.94 : x
2. Step 2: Convert to fraction form
   20,781.32/31,172.00 = 5,198.94/x
3. Step 3: Cross multiply
   20,781.32x = 31,172.00 × 5,198.94
4. Step 4: Simplify right side
   20,781.32x = 162,061,331.69
5. Step 5: Solve for x
   x = 162,061,331.69/20,781.32
6. Step 6: Final answer
   x = 7,798.42