Finding the Fourth Proportional to 9,901.80, 13,665.72 and 5,710.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,901.80 : 13,665.72 = 5,710.08 : x
2. Step 2: Convert to fraction form
   9,901.80/13,665.72 = 5,710.08/x
3. Step 3: Cross multiply
   9,901.80x = 13,665.72 × 5,710.08
4. Step 4: Simplify right side
   9,901.80x = 78,032,354.46
5. Step 5: Solve for x
   x = 78,032,354.46/9,901.80
6. Step 6: Final answer
   x = 7,880.62