Finding the Fourth Proportional to 20,749.08, 31,123.56 and 5,166.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,749.08 : 31,123.56 = 5,166.72 : x
2. Step 2: Convert to fraction form
   20,749.08/31,123.56 = 5,166.72/x
3. Step 3: Cross multiply
   20,749.08x = 31,123.56 × 5,166.72
4. Step 4: Simplify right side
   20,749.08x = 160,806,719.92
5. Step 5: Solve for x
   x = 160,806,719.92/20,749.08
6. Step 6: Final answer
   x = 7,750.07