Finding the Fourth Proportional to 9,399.30, 12,970.13 and 5,621.70

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.30 : 12,970.13 = 5,621.70 : x
2. Step 2: Convert to fraction form
   9,399.30/12,970.13 = 5,621.70/x
3. Step 3: Cross multiply
   9,399.30x = 12,970.13 × 5,621.70
4. Step 4: Simplify right side
   9,399.30x = 72,914,179.82
5. Step 5: Solve for x
   x = 72,914,179.82/9,399.30
6. Step 6: Final answer
   x = 7,757.41