Finding the Fourth Proportional to 1,205.60, 1,807.61 and 620.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,205.60 : 1,807.61 = 620.82 : x
2. Step 2: Convert to fraction form
   1,205.60/1,807.61 = 620.82/x
3. Step 3: Cross multiply
   1,205.60x = 1,807.61 × 620.82
4. Step 4: Simplify right side
   1,205.60x = 1,122,197.34
5. Step 5: Solve for x
   x = 1,122,197.34/1,205.60
6. Step 6: Final answer
   x = 930.82