Finding the Fourth Proportional to 13,086.71, 18,059.27 and 7,421.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.71 : 18,059.27 = 7,421.98 : x
2. Step 2: Convert to fraction form
   13,086.71/18,059.27 = 7,421.98/x
3. Step 3: Cross multiply
   13,086.71x = 18,059.27 × 7,421.98
4. Step 4: Simplify right side
   13,086.71x = 134,035,540.75
5. Step 5: Solve for x
   x = 134,035,540.75/13,086.71
6. Step 6: Final answer
   x = 10,242.11