Finding the Fourth Proportional to 9,812.69, 13,540.96 and 5,621.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,812.69 : 13,540.96 = 5,621.21 : x
2. Step 2: Convert to fraction form
   9,812.69/13,540.96 = 5,621.21/x
3. Step 3: Cross multiply
   9,812.69x = 13,540.96 × 5,621.21
4. Step 4: Simplify right side
   9,812.69x = 76,116,579.76
5. Step 5: Solve for x
   x = 76,116,579.76/9,812.69
6. Step 6: Final answer
   x = 7,756.95