Finding the Fourth Proportional to 39,801.70, 59,689.83 and 13,142.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,801.70 : 59,689.83 = 13,142.72 : x
2. Step 2: Convert to fraction form
   39,801.70/59,689.83 = 13,142.72/x
3. Step 3: Cross multiply
   39,801.70x = 59,689.83 × 13,142.72
4. Step 4: Simplify right side
   39,801.70x = 784,486,722.54
5. Step 5: Solve for x
   x = 784,486,722.54/39,801.70
6. Step 6: Final answer
   x = 19,709.88