Finding the Fourth Proportional to 10,982.86, 16,435.98 and 8,985.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,982.86 : 16,435.98 = 8,985.40 : x
2. Step 2: Convert to fraction form
   10,982.86/16,435.98 = 8,985.40/x
3. Step 3: Cross multiply
   10,982.86x = 16,435.98 × 8,985.40
4. Step 4: Simplify right side
   10,982.86x = 147,683,813.60
5. Step 5: Solve for x
   x = 147,683,813.60/10,982.86
6. Step 6: Final answer
   x = 13,446.76