Finding the Fourth Proportional to 13,690.39, 18,892.71 and 7,722.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,690.39 : 18,892.71 = 7,722.04 : x
2. Step 2: Convert to fraction form
   13,690.39/18,892.71 = 7,722.04/x
3. Step 3: Cross multiply
   13,690.39x = 18,892.71 × 7,722.04
4. Step 4: Simplify right side
   13,690.39x = 145,890,262.33
5. Step 5: Solve for x
   x = 145,890,262.33/13,690.39
6. Step 6: Final answer
   x = 10,656.40