Finding the Fourth Proportional to 1,081.54, 1,620.06 and 648.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.54 : 1,620.06 = 648.46 : x
2. Step 2: Convert to fraction form
   1,081.54/1,620.06 = 648.46/x
3. Step 3: Cross multiply
   1,081.54x = 1,620.06 × 648.46
4. Step 4: Simplify right side
   1,081.54x = 1,050,544.11
5. Step 5: Solve for x
   x = 1,050,544.11/1,081.54
6. Step 6: Final answer
   x = 971.34