Finding the Fourth Proportional to 13,635.86, 18,819.15 and 7,667.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,635.86 : 18,819.15 = 7,667.78 : x
2. Step 2: Convert to fraction form
   13,635.86/18,819.15 = 7,667.78/x
3. Step 3: Cross multiply
   13,635.86x = 18,819.15 × 7,667.78
4. Step 4: Simplify right side
   13,635.86x = 144,301,101.99
5. Step 5: Solve for x
   x = 144,301,101.99/13,635.86
6. Step 6: Final answer
   x = 10,582.47