Finding the Fourth Proportional to 42,725.05, 64,087.72 and 13,142.68

Step by Step Solution

1. Step 1: Write the proportion equation
   42,725.05 : 64,087.72 = 13,142.68 : x
2. Step 2: Convert to fraction form
   42,725.05/64,087.72 = 13,142.68/x
3. Step 3: Cross multiply
   42,725.05x = 64,087.72 × 13,142.68
4. Step 4: Simplify right side
   42,725.05x = 842,284,395.89
5. Step 5: Solve for x
   x = 842,284,395.89/42,725.05
6. Step 6: Final answer
   x = 19,714.06