Finding the Fourth Proportional to 16,816.51, 25,228.72 and 5,129.73

Step by Step Solution

1. Step 1: Write the proportion equation
   16,816.51 : 25,228.72 = 5,129.73 : x
2. Step 2: Convert to fraction form
   16,816.51/25,228.72 = 5,129.73/x
3. Step 3: Cross multiply
   16,816.51x = 25,228.72 × 5,129.73
4. Step 4: Simplify right side
   16,816.51x = 129,416,499.40
5. Step 5: Solve for x
   x = 129,416,499.40/16,816.51
6. Step 6: Final answer
   x = 7,695.80