Finding the Fourth Proportional to 13,865.43, 19,131.28 and 8,200.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,865.43 : 19,131.28 = 8,200.50 : x
2. Step 2: Convert to fraction form
   13,865.43/19,131.28 = 8,200.50/x
3. Step 3: Cross multiply
   13,865.43x = 19,131.28 × 8,200.50
4. Step 4: Simplify right side
   13,865.43x = 156,886,061.64
5. Step 5: Solve for x
   x = 156,886,061.64/13,865.43
6. Step 6: Final answer
   x = 11,314.91