Finding the Fourth Proportional to 20,880.72, 31,322.18 and 5,298.48

Step by Step Solution

1. Step 1: Write the proportion equation
   20,880.72 : 31,322.18 = 5,298.48 : x
2. Step 2: Convert to fraction form
   20,880.72/31,322.18 = 5,298.48/x
3. Step 3: Cross multiply
   20,880.72x = 31,322.18 × 5,298.48
4. Step 4: Simplify right side
   20,880.72x = 165,959,944.29
5. Step 5: Solve for x
   x = 165,959,944.29/20,880.72
6. Step 6: Final answer
   x = 7,948.00