Finding the Fourth Proportional to 9,966.62, 13,752.50 and 5,717.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,966.62 : 13,752.50 = 5,717.87 : x
2. Step 2: Convert to fraction form
   9,966.62/13,752.50 = 5,717.87/x
3. Step 3: Cross multiply
   9,966.62x = 13,752.50 × 5,717.87
4. Step 4: Simplify right side
   9,966.62x = 78,634,909.82
5. Step 5: Solve for x
   x = 78,634,909.82/9,966.62
6. Step 6: Final answer
   x = 7,889.83