Finding the Fourth Proportional to 13,449.50, 18,560.31 and 7,561.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,449.50 : 18,560.31 = 7,561.50 : x
2. Step 2: Convert to fraction form
   13,449.50/18,560.31 = 7,561.50/x
3. Step 3: Cross multiply
   13,449.50x = 18,560.31 × 7,561.50
4. Step 4: Simplify right side
   13,449.50x = 140,343,784.07
5. Step 5: Solve for x
   x = 140,343,784.07/13,449.50
6. Step 6: Final answer
   x = 10,434.87