Finding the Fourth Proportional to 2,617.50, 3,611.78 and 1,621.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.50 : 3,611.78 = 1,621.70 : x
2. Step 2: Convert to fraction form
   2,617.50/3,611.78 = 1,621.70/x
3. Step 3: Cross multiply
   2,617.50x = 3,611.78 × 1,621.70
4. Step 4: Simplify right side
   2,617.50x = 5,857,223.63
5. Step 5: Solve for x
   x = 5,857,223.63/2,617.50
6. Step 6: Final answer
   x = 2,237.72