Finding the Fourth Proportional to 9,931.31, 13,704.53 and 5,455.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,931.31 : 13,704.53 = 5,455.25 : x
2. Step 2: Convert to fraction form
   9,931.31/13,704.53 = 5,455.25/x
3. Step 3: Cross multiply
   9,931.31x = 13,704.53 × 5,455.25
4. Step 4: Simplify right side
   9,931.31x = 74,761,541.48
5. Step 5: Solve for x
   x = 74,761,541.48/9,931.31
6. Step 6: Final answer
   x = 7,527.87