Finding the Fourth Proportional to 10,002.72, 13,806.54 and 5,811.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,002.72 : 13,806.54 = 5,811.78 : x
2. Step 2: Convert to fraction form
   10,002.72/13,806.54 = 5,811.78/x
3. Step 3: Cross multiply
   10,002.72x = 13,806.54 × 5,811.78
4. Step 4: Simplify right side
   10,002.72x = 80,240,573.04
5. Step 5: Solve for x
   x = 80,240,573.04/10,002.72
6. Step 6: Final answer
   x = 8,021.88