Finding the Fourth Proportional to 1,083.95, 1,623.30 and 620.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.95 : 1,623.30 = 620.33 : x
2. Step 2: Convert to fraction form
   1,083.95/1,623.30 = 620.33/x
3. Step 3: Cross multiply
   1,083.95x = 1,623.30 × 620.33
4. Step 4: Simplify right side
   1,083.95x = 1,006,973.57
5. Step 5: Solve for x
   x = 1,006,973.57/1,083.95
6. Step 6: Final answer
   x = 928.99