Finding the Fourth Proportional to 13,690.52, 18,892.89 and 7,722.17

Step by Step Solution

1. Step 1: Write the proportion equation
   13,690.52 : 18,892.89 = 7,722.17 : x
2. Step 2: Convert to fraction form
   13,690.52/18,892.89 = 7,722.17/x
3. Step 3: Cross multiply
   13,690.52x = 18,892.89 × 7,722.17
4. Step 4: Simplify right side
   13,690.52x = 145,893,975.30
5. Step 5: Solve for x
   x = 145,893,975.30/13,690.52
6. Step 6: Final answer
   x = 10,656.57