Finding the Fourth Proportional to 12,911.61, 17,817.28 and 7,245.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,911.61 : 17,817.28 = 7,245.82 : x
2. Step 2: Convert to fraction form
   12,911.61/17,817.28 = 7,245.82/x
3. Step 3: Cross multiply
   12,911.61x = 17,817.28 × 7,245.82
4. Step 4: Simplify right side
   12,911.61x = 129,100,803.77
5. Step 5: Solve for x
   x = 129,100,803.77/12,911.61
6. Step 6: Final answer
   x = 9,998.82