Finding the Fourth Proportional to 13,499.78, 18,630.08 and 7,531.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,499.78 : 18,630.08 = 7,531.31 : x
2. Step 2: Convert to fraction form
   13,499.78/18,630.08 = 7,531.31/x
3. Step 3: Cross multiply
   13,499.78x = 18,630.08 × 7,531.31
4. Step 4: Simplify right side
   13,499.78x = 140,308,777.00
5. Step 5: Solve for x
   x = 140,308,777.00/13,499.78
6. Step 6: Final answer
   x = 10,393.42