Finding the Fourth Proportional to 10,812.86, 16,213.01 and 5,259.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,812.86 : 16,213.01 = 5,259.20 : x
2. Step 2: Convert to fraction form
   10,812.86/16,213.01 = 5,259.20/x
3. Step 3: Cross multiply
   10,812.86x = 16,213.01 × 5,259.20
4. Step 4: Simplify right side
   10,812.86x = 85,267,354.83
5. Step 5: Solve for x
   x = 85,267,354.83/10,812.86
6. Step 6: Final answer
   x = 7,885.74