Finding the Fourth Proportional to 9,421.99, 13,002.50 and 5,173.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,421.99 : 13,002.50 = 5,173.23 : x
2. Step 2: Convert to fraction form
   9,421.99/13,002.50 = 5,173.23/x
3. Step 3: Cross multiply
   9,421.99x = 13,002.50 × 5,173.23
4. Step 4: Simplify right side
   9,421.99x = 67,264,911.16
5. Step 5: Solve for x
   x = 67,264,911.16/9,421.99
6. Step 6: Final answer
   x = 7,139.14