Finding the Fourth Proportional to 12,910.88, 17,817.36 and 7,322.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.88 : 17,817.36 = 7,322.72 : x
2. Step 2: Convert to fraction form
   12,910.88/17,817.36 = 7,322.72/x
3. Step 3: Cross multiply
   12,910.88x = 17,817.36 × 7,322.72
4. Step 4: Simplify right side
   12,910.88x = 130,471,538.42
5. Step 5: Solve for x
   x = 130,471,538.42/12,910.88
6. Step 6: Final answer
   x = 10,105.55