Finding the Fourth Proportional to 1,085.32, 1,623.94 and 646.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.32 : 1,623.94 = 646.81 : x
2. Step 2: Convert to fraction form
   1,085.32/1,623.94 = 646.81/x
3. Step 3: Cross multiply
   1,085.32x = 1,623.94 × 646.81
4. Step 4: Simplify right side
   1,085.32x = 1,050,373.47
5. Step 5: Solve for x
   x = 1,050,373.47/1,085.32
6. Step 6: Final answer
   x = 967.80