Finding the Fourth Proportional to 13,694.31, 18,898.16 and 7,406.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,694.31 : 18,898.16 = 7,406.69 : x
2. Step 2: Convert to fraction form
   13,694.31/18,898.16 = 7,406.69/x
3. Step 3: Cross multiply
   13,694.31x = 18,898.16 × 7,406.69
4. Step 4: Simplify right side
   13,694.31x = 139,972,681.17
5. Step 5: Solve for x
   x = 139,972,681.17/13,694.31
6. Step 6: Final answer
   x = 10,221.23