Finding the Fourth Proportional to 9,891.72, 13,650.90 and 5,700.36

Step by Step Solution

1. Step 1: Write the proportion equation
   9,891.72 : 13,650.90 = 5,700.36 : x
2. Step 2: Convert to fraction form
   9,891.72/13,650.90 = 5,700.36/x
3. Step 3: Cross multiply
   9,891.72x = 13,650.90 × 5,700.36
4. Step 4: Simplify right side
   9,891.72x = 77,815,044.32
5. Step 5: Solve for x
   x = 77,815,044.32/9,891.72
6. Step 6: Final answer
   x = 7,866.68