Finding the Fourth Proportional to 2,070.78, 3,104.54 and 838.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.78 : 3,104.54 = 838.50 : x
2. Step 2: Convert to fraction form
   2,070.78/3,104.54 = 838.50/x
3. Step 3: Cross multiply
   2,070.78x = 3,104.54 × 838.50
4. Step 4: Simplify right side
   2,070.78x = 2,603,156.79
5. Step 5: Solve for x
   x = 2,603,156.79/2,070.78
6. Step 6: Final answer
   x = 1,257.09