Finding the Fourth Proportional to 2,978.70, 4,106.82 and 2,128.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.70 : 4,106.82 = 2,128.96 : x
2. Step 2: Convert to fraction form
   2,978.70/4,106.82 = 2,128.96/x
3. Step 3: Cross multiply
   2,978.70x = 4,106.82 × 2,128.96
4. Step 4: Simplify right side
   2,978.70x = 8,743,255.51
5. Step 5: Solve for x
   x = 8,743,255.51/2,978.70
6. Step 6: Final answer
   x = 2,935.26