Finding the Fourth Proportional to 9,890.72, 13,649.52 and 5,699.36

Step by Step Solution

1. Step 1: Write the proportion equation
   9,890.72 : 13,649.52 = 5,699.36 : x
2. Step 2: Convert to fraction form
   9,890.72/13,649.52 = 5,699.36/x
3. Step 3: Cross multiply
   9,890.72x = 13,649.52 × 5,699.36
4. Step 4: Simplify right side
   9,890.72x = 77,793,528.31
5. Step 5: Solve for x
   x = 77,793,528.31/9,890.72
6. Step 6: Final answer
   x = 7,865.30