Finding the Fourth Proportional to 12,910.86, 17,817.72 and 7,245.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.86 : 17,817.72 = 7,245.30 : x
2. Step 2: Convert to fraction form
   12,910.86/17,817.72 = 7,245.30/x
3. Step 3: Cross multiply
   12,910.86x = 17,817.72 × 7,245.30
4. Step 4: Simplify right side
   12,910.86x = 129,094,726.72
5. Step 5: Solve for x
   x = 129,094,726.72/12,910.86
6. Step 6: Final answer
   x = 9,998.93