Finding the Fourth Proportional to 9,901.75, 13,664.73 and 5,425.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,901.75 : 13,664.73 = 5,425.78 : x
2. Step 2: Convert to fraction form
   9,901.75/13,664.73 = 5,425.78/x
3. Step 3: Cross multiply
   9,901.75x = 13,664.73 × 5,425.78
4. Step 4: Simplify right side
   9,901.75x = 74,141,791.61
5. Step 5: Solve for x
   x = 74,141,791.61/9,901.75
6. Step 6: Final answer
   x = 7,487.75