Finding the Fourth Proportional to 9,901.85, 13,664.55 and 5,425.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,901.85 : 13,664.55 = 5,425.88 : x
2. Step 2: Convert to fraction form
   9,901.85/13,664.55 = 5,425.88/x
3. Step 3: Cross multiply
   9,901.85x = 13,664.55 × 5,425.88
4. Step 4: Simplify right side
   9,901.85x = 74,142,208.55
5. Step 5: Solve for x
   x = 74,142,208.55/9,901.85
6. Step 6: Final answer
   x = 7,487.71