Finding the Fourth Proportional to 2,128.52, 2,957.60 and 2,105.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.52 : 2,957.60 = 2,105.70 : x
2. Step 2: Convert to fraction form
   2,128.52/2,957.60 = 2,105.70/x
3. Step 3: Cross multiply
   2,128.52x = 2,957.60 × 2,105.70
4. Step 4: Simplify right side
   2,128.52x = 6,227,818.32
5. Step 5: Solve for x
   x = 6,227,818.32/2,128.52
6. Step 6: Final answer
   x = 2,925.89