Finding the Fourth Proportional to 1,986.86, 2,979.71 and 670.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.86 : 2,979.71 = 670.46 : x
2. Step 2: Convert to fraction form
   1,986.86/2,979.71 = 670.46/x
3. Step 3: Cross multiply
   1,986.86x = 2,979.71 × 670.46
4. Step 4: Simplify right side
   1,986.86x = 1,997,758.12
5. Step 5: Solve for x
   x = 1,997,758.12/1,986.86
6. Step 6: Final answer
   x = 1,005.49