Finding the Fourth Proportional to 40,857.48, 61,272.72 and 13,149

Step by Step Solution

1. Step 1: Write the proportion equation
   40,857.48 : 61,272.72 = 13,149 : x
2. Step 2: Convert to fraction form
   40,857.48/61,272.72 = 13,149/x
3. Step 3: Cross multiply
   40,857.48x = 61,272.72 × 13,149
4. Step 4: Simplify right side
   40,857.48x = 805,674,995.28
5. Step 5: Solve for x
   x = 805,674,995.28/40,857.48
6. Step 6: Final answer
   x = 19,719.16