Finding the Fourth Proportional to 20,878.72, 31,319.18 and 5,296.48

Step by Step Solution

1. Step 1: Write the proportion equation
   20,878.72 : 31,319.18 = 5,296.48 : x
2. Step 2: Convert to fraction form
   20,878.72/31,319.18 = 5,296.48/x
3. Step 3: Cross multiply
   20,878.72x = 31,319.18 × 5,296.48
4. Step 4: Simplify right side
   20,878.72x = 165,881,410.49
5. Step 5: Solve for x
   x = 165,881,410.49/20,878.72
6. Step 6: Final answer
   x = 7,945.00