Finding the Fourth Proportional to 12,148.72, 16,712.53 and 9,905.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,148.72 : 16,712.53 = 9,905.69 : x
2. Step 2: Convert to fraction form
   12,148.72/16,712.53 = 9,905.69/x
3. Step 3: Cross multiply
   12,148.72x = 16,712.53 × 9,905.69
4. Step 4: Simplify right side
   12,148.72x = 165,549,158.31
5. Step 5: Solve for x
   x = 165,549,158.31/12,148.72
6. Step 6: Final answer
   x = 13,626.88