Finding the Fourth Proportional to 9,997.40, 15,005.16 and 5,321.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,997.40 : 15,005.16 = 5,321.34 : x
2. Step 2: Convert to fraction form
   9,997.40/15,005.16 = 5,321.34/x
3. Step 3: Cross multiply
   9,997.40x = 15,005.16 × 5,321.34
4. Step 4: Simplify right side
   9,997.40x = 79,847,558.11
5. Step 5: Solve for x
   x = 79,847,558.11/9,997.40
6. Step 6: Final answer
   x = 7,986.84