Finding the Fourth Proportional to 13,621.72, 18,795.98 and 7,652.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,621.72 : 18,795.98 = 7,652.20 : x
2. Step 2: Convert to fraction form
   13,621.72/18,795.98 = 7,652.20/x
3. Step 3: Cross multiply
   13,621.72x = 18,795.98 × 7,652.20
4. Step 4: Simplify right side
   13,621.72x = 143,830,640.78
5. Step 5: Solve for x
   x = 143,830,640.78/13,621.72
6. Step 6: Final answer
   x = 10,558.92