Finding the Fourth Proportional to 12,618.72, 17,412.72 and 7,311.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,618.72 : 17,412.72 = 7,311.84 : x
2. Step 2: Convert to fraction form
   12,618.72/17,412.72 = 7,311.84/x
3. Step 3: Cross multiply
   12,618.72x = 17,412.72 × 7,311.84
4. Step 4: Simplify right side
   12,618.72x = 127,319,022.60
5. Step 5: Solve for x
   x = 127,319,022.60/12,618.72
6. Step 6: Final answer
   x = 10,089.69