Finding the Fourth Proportional to 9,401.23, 12,970.18 and 5,420.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,401.23 : 12,970.18 = 5,420.89 : x
2. Step 2: Convert to fraction form
   9,401.23/12,970.18 = 5,420.89/x
3. Step 3: Cross multiply
   9,401.23x = 12,970.18 × 5,420.89
4. Step 4: Simplify right side
   9,401.23x = 70,309,919.06
5. Step 5: Solve for x
   x = 70,309,919.06/9,401.23
6. Step 6: Final answer
   x = 7,478.80