Finding the Fourth Proportional to 9,699.63, 13,385.78 and 5,724.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,699.63 : 13,385.78 = 5,724.15 : x
2. Step 2: Convert to fraction form
   9,699.63/13,385.78 = 5,724.15/x
3. Step 3: Cross multiply
   9,699.63x = 13,385.78 × 5,724.15
4. Step 4: Simplify right side
   9,699.63x = 76,622,212.59
5. Step 5: Solve for x
   x = 76,622,212.59/9,699.63
6. Step 6: Final answer
   x = 7,899.50