Finding the Fourth Proportional to 13,665.60, 18,860.31 and 7,698.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,665.60 : 18,860.31 = 7,698.42 : x
2. Step 2: Convert to fraction form
   13,665.60/18,860.31 = 7,698.42/x
3. Step 3: Cross multiply
   13,665.60x = 18,860.31 × 7,698.42
4. Step 4: Simplify right side
   13,665.60x = 145,194,587.71
5. Step 5: Solve for x
   x = 145,194,587.71/13,665.60
6. Step 6: Final answer
   x = 10,624.82