Finding the Fourth Proportional to 1,961.33, 2,941.40 and 728.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,961.33 : 2,941.40 = 728.55 : x
2. Step 2: Convert to fraction form
   1,961.33/2,941.40 = 728.55/x
3. Step 3: Cross multiply
   1,961.33x = 2,941.40 × 728.55
4. Step 4: Simplify right side
   1,961.33x = 2,142,953.33
5. Step 5: Solve for x
   x = 2,142,953.33/1,961.33
6. Step 6: Final answer
   x = 1,092.60