Finding the Fourth Proportional to 9,105.80, 13,638.54 and 5,207.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,105.80 : 13,638.54 = 5,207.72 : x
2. Step 2: Convert to fraction form
   9,105.80/13,638.54 = 5,207.72/x
3. Step 3: Cross multiply
   9,105.80x = 13,638.54 × 5,207.72
4. Step 4: Simplify right side
   9,105.80x = 71,025,697.53
5. Step 5: Solve for x
   x = 71,025,697.53/9,105.80
6. Step 6: Final answer
   x = 7,800.05