Finding the Fourth Proportional to 39,783, 59,661.76 and 13,123.02

Step by Step Solution

1. Step 1: Write the proportion equation
   39,783 : 59,661.76 = 13,123.02 : x
2. Step 2: Convert to fraction form
   39,783/59,661.76 = 13,123.02/x
3. Step 3: Cross multiply
   39,783x = 59,661.76 × 13,123.02
4. Step 4: Simplify right side
   39,783x = 782,942,469.72
5. Step 5: Solve for x
   x = 782,942,469.72/39,783
6. Step 6: Final answer
   x = 19,680.33