Finding the Fourth Proportional to 11,997.60, 17,997.98 and 3,678.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,997.60 : 17,997.98 = 3,678.18 : x
2. Step 2: Convert to fraction form
   11,997.60/17,997.98 = 3,678.18/x
3. Step 3: Cross multiply
   11,997.60x = 17,997.98 × 3,678.18
4. Step 4: Simplify right side
   11,997.60x = 66,199,791.69
5. Step 5: Solve for x
   x = 66,199,791.69/11,997.60
6. Step 6: Final answer
   x = 5,517.75