Finding the Fourth Proportional to 42,661.66, 64,001.83 and 13,081.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,661.66 : 64,001.83 = 13,081.80 : x
2. Step 2: Convert to fraction form
   42,661.66/64,001.83 = 13,081.80/x
3. Step 3: Cross multiply
   42,661.66x = 64,001.83 × 13,081.80
4. Step 4: Simplify right side
   42,661.66x = 837,259,139.69
5. Step 5: Solve for x
   x = 837,259,139.69/42,661.66
6. Step 6: Final answer
   x = 19,625.56