Finding the Fourth Proportional to 13,469.21, 18,587.53 and 7,805.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,469.21 : 18,587.53 = 7,805.05 : x
2. Step 2: Convert to fraction form
   13,469.21/18,587.53 = 7,805.05/x
3. Step 3: Cross multiply
   13,469.21x = 18,587.53 × 7,805.05
4. Step 4: Simplify right side
   13,469.21x = 145,076,638.54
5. Step 5: Solve for x
   x = 145,076,638.54/13,469.21
6. Step 6: Final answer
   x = 10,770.98