Finding the Fourth Proportional to 1,082.52, 1,621.32 and 648.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,082.52 : 1,621.32 = 648.84 : x
2. Step 2: Convert to fraction form
   1,082.52/1,621.32 = 648.84/x
3. Step 3: Cross multiply
   1,082.52x = 1,621.32 × 648.84
4. Step 4: Simplify right side
   1,082.52x = 1,051,977.27
5. Step 5: Solve for x
   x = 1,051,977.27/1,082.52
6. Step 6: Final answer
   x = 971.79