Finding the Fourth Proportional to 11,605.95, 17,415 and 10,978.61

Step by Step Solution

1. Step 1: Write the proportion equation
   11,605.95 : 17,415 = 10,978.61 : x
2. Step 2: Convert to fraction form
   11,605.95/17,415 = 10,978.61/x
3. Step 3: Cross multiply
   11,605.95x = 17,415 × 10,978.61
4. Step 4: Simplify right side
   11,605.95x = 191,192,406.08
5. Step 5: Solve for x
   x = 191,192,406.08/11,605.95
6. Step 6: Final answer
   x = 16,473.65