Finding the Fourth Proportional to 1,987.38, 2,979.81 and 945.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.38 : 2,979.81 = 945.99 : x
2. Step 2: Convert to fraction form
   1,987.38/2,979.81 = 945.99/x
3. Step 3: Cross multiply
   1,987.38x = 2,979.81 × 945.99
4. Step 4: Simplify right side
   1,987.38x = 2,818,870.46
5. Step 5: Solve for x
   x = 2,818,870.46/1,987.38
6. Step 6: Final answer
   x = 1,418.39