Finding the Fourth Proportional to 9,386.65, 12,953.87 and 5,408.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,386.65 : 12,953.87 = 5,408.56 : x
2. Step 2: Convert to fraction form
   9,386.65/12,953.87 = 5,408.56/x
3. Step 3: Cross multiply
   9,386.65x = 12,953.87 × 5,408.56
4. Step 4: Simplify right side
   9,386.65x = 70,061,783.13
5. Step 5: Solve for x
   x = 70,061,783.13/9,386.65
6. Step 6: Final answer
   x = 7,463.98