Finding the Fourth Proportional to 1,913.34, 2,870.61 and 1,328.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.34 : 2,870.61 = 1,328.91 : x
2. Step 2: Convert to fraction form
   1,913.34/2,870.61 = 1,328.91/x
3. Step 3: Cross multiply
   1,913.34x = 2,870.61 × 1,328.91
4. Step 4: Simplify right side
   1,913.34x = 3,814,782.34
5. Step 5: Solve for x
   x = 3,814,782.34/1,913.34
6. Step 6: Final answer
   x = 1,993.78