Finding the Fourth Proportional to 42,661.62, 64,004.72 and 13,083.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,661.62 : 64,004.72 = 13,083.80 : x
2. Step 2: Convert to fraction form
   42,661.62/64,004.72 = 13,083.80/x
3. Step 3: Cross multiply
   42,661.62x = 64,004.72 × 13,083.80
4. Step 4: Simplify right side
   42,661.62x = 837,424,570.09
5. Step 5: Solve for x
   x = 837,424,570.09/42,661.62
6. Step 6: Final answer
   x = 19,629.46