Finding the Fourth Proportional to 1,914.81, 2,870.67 and 681.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,914.81 : 2,870.67 = 681.55 : x
2. Step 2: Convert to fraction form
   1,914.81/2,870.67 = 681.55/x
3. Step 3: Cross multiply
   1,914.81x = 2,870.67 × 681.55
4. Step 4: Simplify right side
   1,914.81x = 1,956,506.88
5. Step 5: Solve for x
   x = 1,956,506.88/1,914.81
6. Step 6: Final answer
   x = 1,021.77