Finding the Fourth Proportional to 9,921.45, 13,690.56 and 5,673.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,921.45 : 13,690.56 = 5,673.62 : x
2. Step 2: Convert to fraction form
   9,921.45/13,690.56 = 5,673.62/x
3. Step 3: Cross multiply
   9,921.45x = 13,690.56 × 5,673.62
4. Step 4: Simplify right side
   9,921.45x = 77,674,966.57
5. Step 5: Solve for x
   x = 77,674,966.57/9,921.45
6. Step 6: Final answer
   x = 7,828.99