Finding the Fourth Proportional to 10,710.72, 14,784.88 and 7,172.64

Step by Step Solution

1. Step 1: Write the proportion equation
   10,710.72 : 14,784.88 = 7,172.64 : x
2. Step 2: Convert to fraction form
   10,710.72/14,784.88 = 7,172.64/x
3. Step 3: Cross multiply
   10,710.72x = 14,784.88 × 7,172.64
4. Step 4: Simplify right side
   10,710.72x = 106,046,621.68
5. Step 5: Solve for x
   x = 106,046,621.68/10,710.72
6. Step 6: Final answer
   x = 9,900.98