Finding the Fourth Proportional to 9,399.40, 12,970.79 and 5,620.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.40 : 12,970.79 = 5,620.34 : x
2. Step 2: Convert to fraction form
   9,399.40/12,970.79 = 5,620.34/x
3. Step 3: Cross multiply
   9,399.40x = 12,970.79 × 5,620.34
4. Step 4: Simplify right side
   9,399.40x = 72,900,218.12
5. Step 5: Solve for x
   x = 72,900,218.12/9,399.40
6. Step 6: Final answer
   x = 7,755.84