Finding the Fourth Proportional to 9,389.12, 12,956.56 and 5,410.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.12 : 12,956.56 = 5,410.80 : x
2. Step 2: Convert to fraction form
   9,389.12/12,956.56 = 5,410.80/x
3. Step 3: Cross multiply
   9,389.12x = 12,956.56 × 5,410.80
4. Step 4: Simplify right side
   9,389.12x = 70,105,341.32
5. Step 5: Solve for x
   x = 70,105,341.32/9,389.12
6. Step 6: Final answer
   x = 7,466.66