Finding the Fourth Proportional to 1,905.52, 2,621.64 and 1,680.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,905.52 : 2,621.64 = 1,680.42 : x
2. Step 2: Convert to fraction form
   1,905.52/2,621.64 = 1,680.42/x
3. Step 3: Cross multiply
   1,905.52x = 2,621.64 × 1,680.42
4. Step 4: Simplify right side
   1,905.52x = 4,405,456.29
5. Step 5: Solve for x
   x = 4,405,456.29/1,905.52
6. Step 6: Final answer
   x = 2,311.94