Finding the Fourth Proportional to 11,421.99, 17,130.89 and 5,180.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,421.99 : 17,130.89 = 5,180.50 : x
2. Step 2: Convert to fraction form
   11,421.99/17,130.89 = 5,180.50/x
3. Step 3: Cross multiply
   11,421.99x = 17,130.89 × 5,180.50
4. Step 4: Simplify right side
   11,421.99x = 88,746,464.09
5. Step 5: Solve for x
   x = 88,746,464.09/11,421.99
6. Step 6: Final answer
   x = 7,769.79