Finding the Fourth Proportional to 9,402.39, 12,974.72 and 5,210.67

Step by Step Solution

1. Step 1: Write the proportion equation
   9,402.39 : 12,974.72 = 5,210.67 : x
2. Step 2: Convert to fraction form
   9,402.39/12,974.72 = 5,210.67/x
3. Step 3: Cross multiply
   9,402.39x = 12,974.72 × 5,210.67
4. Step 4: Simplify right side
   9,402.39x = 67,606,958.21
5. Step 5: Solve for x
   x = 67,606,958.21/9,402.39
6. Step 6: Final answer
   x = 7,190.40