Finding the Fourth Proportional to 11,990.72, 17,991.64 and 4,592.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,990.72 : 17,991.64 = 4,592.72 : x
2. Step 2: Convert to fraction form
   11,990.72/17,991.64 = 4,592.72/x
3. Step 3: Cross multiply
   11,990.72x = 17,991.64 × 4,592.72
4. Step 4: Simplify right side
   11,990.72x = 82,630,564.86
5. Step 5: Solve for x
   x = 82,630,564.86/11,990.72
6. Step 6: Final answer
   x = 6,891.21