Finding the Fourth Proportional to 13,665.16, 20,493.42 and 4,429

Step by Step Solution

1. Step 1: Write the proportion equation
   13,665.16 : 20,493.42 = 4,429 : x
2. Step 2: Convert to fraction form
   13,665.16/20,493.42 = 4,429/x
3. Step 3: Cross multiply
   13,665.16x = 20,493.42 × 4,429
4. Step 4: Simplify right side
   13,665.16x = 90,765,357.18
5. Step 5: Solve for x
   x = 90,765,357.18/13,665.16
6. Step 6: Final answer
   x = 6,642.10