Finding the Fourth Proportional to 1,082.02, 1,621.41 and 648.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,082.02 : 1,621.41 = 648.70 : x
2. Step 2: Convert to fraction form
   1,082.02/1,621.41 = 648.70/x
3. Step 3: Cross multiply
   1,082.02x = 1,621.41 × 648.70
4. Step 4: Simplify right side
   1,082.02x = 1,051,808.67
5. Step 5: Solve for x
   x = 1,051,808.67/1,082.02
6. Step 6: Final answer
   x = 972.08