Finding the Fourth Proportional to 10,002.15, 13,806.05 and 7,018.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,002.15 : 13,806.05 = 7,018.72 : x
2. Step 2: Convert to fraction form
   10,002.15/13,806.05 = 7,018.72/x
3. Step 3: Cross multiply
   10,002.15x = 13,806.05 × 7,018.72
4. Step 4: Simplify right side
   10,002.15x = 96,900,729.65
5. Step 5: Solve for x
   x = 96,900,729.65/10,002.15
6. Step 6: Final answer
   x = 9,687.99