Finding the Fourth Proportional to 11,669.91, 17,501.61 and 3,878.79

Step by Step Solution

1. Step 1: Write the proportion equation
   11,669.91 : 17,501.61 = 3,878.79 : x
2. Step 2: Convert to fraction form
   11,669.91/17,501.61 = 3,878.79/x
3. Step 3: Cross multiply
   11,669.91x = 17,501.61 × 3,878.79
4. Step 4: Simplify right side
   11,669.91x = 67,885,069.85
5. Step 5: Solve for x
   x = 67,885,069.85/11,669.91
6. Step 6: Final answer
   x = 5,817.10