Finding the Fourth Proportional to 11,430.72, 17,137.88 and 5,187.59

Step by Step Solution

1. Step 1: Write the proportion equation
   11,430.72 : 17,137.88 = 5,187.59 : x
2. Step 2: Convert to fraction form
   11,430.72/17,137.88 = 5,187.59/x
3. Step 3: Cross multiply
   11,430.72x = 17,137.88 × 5,187.59
4. Step 4: Simplify right side
   11,430.72x = 88,904,363.40
5. Step 5: Solve for x
   x = 88,904,363.40/11,430.72
6. Step 6: Final answer
   x = 7,777.67