Finding the Fourth Proportional to 3,288.30, 4,931.52 and 1,621.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,288.30 : 4,931.52 = 1,621.63 : x
2. Step 2: Convert to fraction form
   3,288.30/4,931.52 = 1,621.63/x
3. Step 3: Cross multiply
   3,288.30x = 4,931.52 × 1,621.63
4. Step 4: Simplify right side
   3,288.30x = 7,997,100.78
5. Step 5: Solve for x
   x = 7,997,100.78/3,288.30
6. Step 6: Final answer
   x = 2,431.99