Finding the Fourth Proportional to 1,913.18, 2,870.18 and 680.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.18 : 2,870.18 = 680.59 : x
2. Step 2: Convert to fraction form
   1,913.18/2,870.18 = 680.59/x
3. Step 3: Cross multiply
   1,913.18x = 2,870.18 × 680.59
4. Step 4: Simplify right side
   1,913.18x = 1,953,421.29
5. Step 5: Solve for x
   x = 1,953,421.29/1,913.18
6. Step 6: Final answer
   x = 1,021.03