Finding the Fourth Proportional to 9,901.17, 13,665.42 and 5,709.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,901.17 : 13,665.42 = 5,709.42 : x
2. Step 2: Convert to fraction form
   9,901.17/13,665.42 = 5,709.42/x
3. Step 3: Cross multiply
   9,901.17x = 13,665.42 × 5,709.42
4. Step 4: Simplify right side
   9,901.17x = 78,021,622.26
5. Step 5: Solve for x
   x = 78,021,622.26/9,901.17
6. Step 6: Final answer
   x = 7,880.04