Finding the Fourth Proportional to 42,661.42, 64,001.46 and 13,081.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,661.42 : 64,001.46 = 13,081.56 : x
2. Step 2: Convert to fraction form
   42,661.42/64,001.46 = 13,081.56/x
3. Step 3: Cross multiply
   42,661.42x = 64,001.46 × 13,081.56
4. Step 4: Simplify right side
   42,661.42x = 837,238,553.66
5. Step 5: Solve for x
   x = 837,238,553.66/42,661.42
6. Step 6: Final answer
   x = 19,625.19