Finding the Fourth Proportional to 13,693.89, 18,897.55 and 7,406.26

Step by Step Solution

1. Step 1: Write the proportion equation
   13,693.89 : 18,897.55 = 7,406.26 : x
2. Step 2: Convert to fraction form
   13,693.89/18,897.55 = 7,406.26/x
3. Step 3: Cross multiply
   13,693.89x = 18,897.55 × 7,406.26
4. Step 4: Simplify right side
   13,693.89x = 139,960,168.66
5. Step 5: Solve for x
   x = 139,960,168.66/13,693.89
6. Step 6: Final answer
   x = 10,220.63