Finding the Fourth Proportional to 1,913.37, 2,870.49 and 680.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.37 : 2,870.49 = 680.91 : x
2. Step 2: Convert to fraction form
   1,913.37/2,870.49 = 680.91/x
3. Step 3: Cross multiply
   1,913.37x = 2,870.49 × 680.91
4. Step 4: Simplify right side
   1,913.37x = 1,954,533.30
5. Step 5: Solve for x
   x = 1,954,533.30/1,913.37
6. Step 6: Final answer
   x = 1,021.51