Finding the Fourth Proportional to 9,400.05, 12,971.61 and 5,421.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,400.05 : 12,971.61 = 5,421.24 : x
2. Step 2: Convert to fraction form
   9,400.05/12,971.61 = 5,421.24/x
3. Step 3: Cross multiply
   9,400.05x = 12,971.61 × 5,421.24
4. Step 4: Simplify right side
   9,400.05x = 70,322,211.00
5. Step 5: Solve for x
   x = 70,322,211.00/9,400.05
6. Step 6: Final answer
   x = 7,481.05