Finding the Fourth Proportional to 13,343.10, 18,412.98 and 7,678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,343.10 : 18,412.98 = 7,678.72 : x
2. Step 2: Convert to fraction form
   13,343.10/18,412.98 = 7,678.72/x
3. Step 3: Cross multiply
   13,343.10x = 18,412.98 × 7,678.72
4. Step 4: Simplify right side
   13,343.10x = 141,388,117.79
5. Step 5: Solve for x
   x = 141,388,117.79/13,343.10
6. Step 6: Final answer
   x = 10,596.35