Finding the Fourth Proportional to 13,629.35, 20,429.43 and 7,048.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,629.35 : 20,429.43 = 7,048.91 : x
2. Step 2: Convert to fraction form
   13,629.35/20,429.43 = 7,048.91/x
3. Step 3: Cross multiply
   13,629.35x = 20,429.43 × 7,048.91
4. Step 4: Simplify right side
   13,629.35x = 144,005,111.27
5. Step 5: Solve for x
   x = 144,005,111.27/13,629.35
6. Step 6: Final answer
   x = 10,565.81