Finding the Fourth Proportional to 1,978.92, 2,970.81 and 1,813.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.92 : 2,970.81 = 1,813.68 : x
2. Step 2: Convert to fraction form
   1,978.92/2,970.81 = 1,813.68/x
3. Step 3: Cross multiply
   1,978.92x = 2,970.81 × 1,813.68
4. Step 4: Simplify right side
   1,978.92x = 5,388,098.68
5. Step 5: Solve for x
   x = 5,388,098.68/1,978.92
6. Step 6: Final answer
   x = 2,722.75