Finding the Fourth Proportional to 13,421.90, 18,522.06 and 7,453.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,421.90 : 18,522.06 = 7,453.55 : x
2. Step 2: Convert to fraction form
   13,421.90/18,522.06 = 7,453.55/x
3. Step 3: Cross multiply
   13,421.90x = 18,522.06 × 7,453.55
4. Step 4: Simplify right side
   13,421.90x = 138,055,100.31
5. Step 5: Solve for x
   x = 138,055,100.31/13,421.90
6. Step 6: Final answer
   x = 10,285.81