Finding the Fourth Proportional to 13,681.72, 18,880.86 and 7,394.08

Step by Step Solution

1. Step 1: Write the proportion equation
   13,681.72 : 18,880.86 = 7,394.08 : x
2. Step 2: Convert to fraction form
   13,681.72/18,880.86 = 7,394.08/x
3. Step 3: Cross multiply
   13,681.72x = 18,880.86 × 7,394.08
4. Step 4: Simplify right side
   13,681.72x = 139,606,589.31
5. Step 5: Solve for x
   x = 139,606,589.31/13,681.72
6. Step 6: Final answer
   x = 10,203.88