Finding the Fourth Proportional to 9,646.72, 13,312.50 and 5,455

Step by Step Solution

1. Step 1: Write the proportion equation
   9,646.72 : 13,312.50 = 5,455 : x
2. Step 2: Convert to fraction form
   9,646.72/13,312.50 = 5,455/x
3. Step 3: Cross multiply
   9,646.72x = 13,312.50 × 5,455
4. Step 4: Simplify right side
   9,646.72x = 72,619,687.50
5. Step 5: Solve for x
   x = 72,619,687.50/9,646.72
6. Step 6: Final answer
   x = 7,527.91