Finding the Fourth Proportional to 10,105.55, 13,945.28 and 5,629.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,105.55 : 13,945.28 = 5,629.21 : x
2. Step 2: Convert to fraction form
   10,105.55/13,945.28 = 5,629.21/x
3. Step 3: Cross multiply
   10,105.55x = 13,945.28 × 5,629.21
4. Step 4: Simplify right side
   10,105.55x = 78,500,888.84
5. Step 5: Solve for x
   x = 78,500,888.84/10,105.55
6. Step 6: Final answer
   x = 7,768.10