Finding the Fourth Proportional to 16,820.10, 25,231.35 and 5,133.30

Step by Step Solution

1. Step 1: Write the proportion equation
   16,820.10 : 25,231.35 = 5,133.30 : x
2. Step 2: Convert to fraction form
   16,820.10/25,231.35 = 5,133.30/x
3. Step 3: Cross multiply
   16,820.10x = 25,231.35 × 5,133.30
4. Step 4: Simplify right side
   16,820.10x = 129,520,088.96
5. Step 5: Solve for x
   x = 129,520,088.96/16,820.10
6. Step 6: Final answer
   x = 7,700.32