Finding the Fourth Proportional to 13,131.50, 19,700.50 and 3,897.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.50 : 19,700.50 = 3,897.50 : x
2. Step 2: Convert to fraction form
   13,131.50/19,700.50 = 3,897.50/x
3. Step 3: Cross multiply
   13,131.50x = 19,700.50 × 3,897.50
4. Step 4: Simplify right side
   13,131.50x = 76,782,698.75
5. Step 5: Solve for x
   x = 76,782,698.75/13,131.50
6. Step 6: Final answer
   x = 5,847.21