Finding the Fourth Proportional to 11,661.78, 17,499.69 and 4,642.59

Step by Step Solution

1. Step 1: Write the proportion equation
   11,661.78 : 17,499.69 = 4,642.59 : x
2. Step 2: Convert to fraction form
   11,661.78/17,499.69 = 4,642.59/x
3. Step 3: Cross multiply
   11,661.78x = 17,499.69 × 4,642.59
4. Step 4: Simplify right side
   11,661.78x = 81,243,885.80
5. Step 5: Solve for x
   x = 81,243,885.80/11,661.78
6. Step 6: Final answer
   x = 6,966.68