Finding the Fourth Proportional to 2,138.82, 2,951.73 and 2,070.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138.82 : 2,951.73 = 2,070.78 : x
2. Step 2: Convert to fraction form
   2,138.82/2,951.73 = 2,070.78/x
3. Step 3: Cross multiply
   2,138.82x = 2,951.73 × 2,070.78
4. Step 4: Simplify right side
   2,138.82x = 6,112,383.45
5. Step 5: Solve for x
   x = 6,112,383.45/2,138.82
6. Step 6: Final answer
   x = 2,857.83