Finding the Fourth Proportional to 9,620.79, 13,275.81 and 5,641.17

Step by Step Solution

1. Step 1: Write the proportion equation
   9,620.79 : 13,275.81 = 5,641.17 : x
2. Step 2: Convert to fraction form
   9,620.79/13,275.81 = 5,641.17/x
3. Step 3: Cross multiply
   9,620.79x = 13,275.81 × 5,641.17
4. Step 4: Simplify right side
   9,620.79x = 74,891,101.10
5. Step 5: Solve for x
   x = 74,891,101.10/9,620.79
6. Step 6: Final answer
   x = 7,784.30