Finding the Fourth Proportional to 20,131.63, 30,013.67 and 19,620.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,131.63 : 30,013.67 = 19,620.10 : x
2. Step 2: Convert to fraction form
   20,131.63/30,013.67 = 19,620.10/x
3. Step 3: Cross multiply
   20,131.63x = 30,013.67 × 19,620.10
4. Step 4: Simplify right side
   20,131.63x = 588,871,206.77
5. Step 5: Solve for x
   x = 588,871,206.77/20,131.63
6. Step 6: Final answer
   x = 29,251.04