Finding the Fourth Proportional to 13,291.72, 19,936.86 and 4,057

Step by Step Solution

1. Step 1: Write the proportion equation
   13,291.72 : 19,936.86 = 4,057 : x
2. Step 2: Convert to fraction form
   13,291.72/19,936.86 = 4,057/x
3. Step 3: Cross multiply
   13,291.72x = 19,936.86 × 4,057
4. Step 4: Simplify right side
   13,291.72x = 80,883,841.02
5. Step 5: Solve for x
   x = 80,883,841.02/13,291.72
6. Step 6: Final answer
   x = 6,085.28