Finding the Fourth Proportional to 42,661.79, 64,002.02 and 13,081.94

Step by Step Solution

1. Step 1: Write the proportion equation
   42,661.79 : 64,002.02 = 13,081.94 : x
2. Step 2: Convert to fraction form
   42,661.79/64,002.02 = 13,081.94/x
3. Step 3: Cross multiply
   42,661.79x = 64,002.02 × 13,081.94
4. Step 4: Simplify right side
   42,661.79x = 837,270,200.10
5. Step 5: Solve for x
   x = 837,270,200.10/42,661.79
6. Step 6: Final answer
   x = 19,625.77