Finding the Fourth Proportional to 10,720.01, 16,086.63 and 5,173.90

Step by Step Solution

1. Step 1: Write the proportion equation
   10,720.01 : 16,086.63 = 5,173.90 : x
2. Step 2: Convert to fraction form
   10,720.01/16,086.63 = 5,173.90/x
3. Step 3: Cross multiply
   10,720.01x = 16,086.63 × 5,173.90
4. Step 4: Simplify right side
   10,720.01x = 83,230,614.96
5. Step 5: Solve for x
   x = 83,230,614.96/10,720.01
6. Step 6: Final answer
   x = 7,764.04