Finding the Fourth Proportional to 6,621.82, 9,139.85 and 4,102.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,621.82 : 9,139.85 = 4,102.50 : x
2. Step 2: Convert to fraction form
   6,621.82/9,139.85 = 4,102.50/x
3. Step 3: Cross multiply
   6,621.82x = 9,139.85 × 4,102.50
4. Step 4: Simplify right side
   6,621.82x = 37,496,234.63
5. Step 5: Solve for x
   x = 37,496,234.63/6,621.82
6. Step 6: Final answer
   x = 5,662.53