Finding the Fourth Proportional to 13,561.20, 18,713.43 and 7,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,561.20 : 18,713.43 = 7,591.50 : x
2. Step 2: Convert to fraction form
   13,561.20/18,713.43 = 7,591.50/x
3. Step 3: Cross multiply
   13,561.20x = 18,713.43 × 7,591.50
4. Step 4: Simplify right side
   13,561.20x = 142,063,003.85
5. Step 5: Solve for x
   x = 142,063,003.85/13,561.20
6. Step 6: Final answer
   x = 10,475.70