Finding the Fourth Proportional to 13,707.63, 18,916.89 and 7,739.35

Step by Step Solution

1. Step 1: Write the proportion equation
   13,707.63 : 18,916.89 = 7,739.35 : x
2. Step 2: Convert to fraction form
   13,707.63/18,916.89 = 7,739.35/x
3. Step 3: Cross multiply
   13,707.63x = 18,916.89 × 7,739.35
4. Step 4: Simplify right side
   13,707.63x = 146,404,399.84
5. Step 5: Solve for x
   x = 146,404,399.84/13,707.63
6. Step 6: Final answer
   x = 10,680.50