Finding the Fourth Proportional to 9,400.71, 12,972.60 and 5,621.65

Step by Step Solution

1. Step 1: Write the proportion equation
   9,400.71 : 12,972.60 = 5,621.65 : x
2. Step 2: Convert to fraction form
   9,400.71/12,972.60 = 5,621.65/x
3. Step 3: Cross multiply
   9,400.71x = 12,972.60 × 5,621.65
4. Step 4: Simplify right side
   9,400.71x = 72,927,433.01
5. Step 5: Solve for x
   x = 72,927,433.01/9,400.71
6. Step 6: Final answer
   x = 7,757.65