Finding the Fourth Proportional to 9,356.34, 12,911.35 and 5,107.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,356.34 : 12,911.35 = 5,107.30 : x
2. Step 2: Convert to fraction form
   9,356.34/12,911.35 = 5,107.30/x
3. Step 3: Cross multiply
   9,356.34x = 12,911.35 × 5,107.30
4. Step 4: Simplify right side
   9,356.34x = 65,942,137.86
5. Step 5: Solve for x
   x = 65,942,137.86/9,356.34
6. Step 6: Final answer
   x = 7,047.86