Finding the Fourth Proportional to 13,150.74, 18,147.56 and 7,842.80

Step by Step Solution

1. Step 1: Write the proportion equation
   13,150.74 : 18,147.56 = 7,842.80 : x
2. Step 2: Convert to fraction form
   13,150.74/18,147.56 = 7,842.80/x
3. Step 3: Cross multiply
   13,150.74x = 18,147.56 × 7,842.80
4. Step 4: Simplify right side
   13,150.74x = 142,327,683.57
5. Step 5: Solve for x
   x = 142,327,683.57/13,150.74
6. Step 6: Final answer
   x = 10,822.79