Finding the Fourth Proportional to 12,980.18, 17,909.96 and 8,262.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.18 : 17,909.96 = 8,262.74 : x
2. Step 2: Convert to fraction form
   12,980.18/17,909.96 = 8,262.74/x
3. Step 3: Cross multiply
   12,980.18x = 17,909.96 × 8,262.74
4. Step 4: Simplify right side
   12,980.18x = 147,985,342.89
5. Step 5: Solve for x
   x = 147,985,342.89/12,980.18
6. Step 6: Final answer
   x = 11,400.87