Finding the Fourth Proportional to 13,767.39, 18,998.61 and 7,479.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,767.39 : 18,998.61 = 7,479.78 : x
2. Step 2: Convert to fraction form
   13,767.39/18,998.61 = 7,479.78/x
3. Step 3: Cross multiply
   13,767.39x = 18,998.61 × 7,479.78
4. Step 4: Simplify right side
   13,767.39x = 142,105,423.11
5. Step 5: Solve for x
   x = 142,105,423.11/13,767.39
6. Step 6: Final answer
   x = 10,321.89