Finding the Fourth Proportional to 11,000.72, 15,174.86 and 7,224.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,000.72 : 15,174.86 = 7,224.50 : x
2. Step 2: Convert to fraction form
   11,000.72/15,174.86 = 7,224.50/x
3. Step 3: Cross multiply
   11,000.72x = 15,174.86 × 7,224.50
4. Step 4: Simplify right side
   11,000.72x = 109,630,776.07
5. Step 5: Solve for x
   x = 109,630,776.07/11,000.72
6. Step 6: Final answer
   x = 9,965.78