Finding the Fourth Proportional to 11,760.78, 17,642.61 and 3,967.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,760.78 : 17,642.61 = 3,967.50 : x
2. Step 2: Convert to fraction form
   11,760.78/17,642.61 = 3,967.50/x
3. Step 3: Cross multiply
   11,760.78x = 17,642.61 × 3,967.50
4. Step 4: Simplify right side
   11,760.78x = 69,997,055.18
5. Step 5: Solve for x
   x = 69,997,055.18/11,760.78
6. Step 6: Final answer
   x = 5,951.74