Finding the Fourth Proportional to 1,939.89, 2,659.62 and 1,904.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,939.89 : 2,659.62 = 1,904.85 : x
2. Step 2: Convert to fraction form
   1,939.89/2,659.62 = 1,904.85/x
3. Step 3: Cross multiply
   1,939.89x = 2,659.62 × 1,904.85
4. Step 4: Simplify right side
   1,939.89x = 5,066,177.16
5. Step 5: Solve for x
   x = 5,066,177.16/1,939.89
6. Step 6: Final answer
   x = 2,611.58