Finding the Fourth Proportional to 2,007.77, 3,006.78 and 1,389.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.77 : 3,006.78 = 1,389.74 : x
2. Step 2: Convert to fraction form
   2,007.77/3,006.78 = 1,389.74/x
3. Step 3: Cross multiply
   2,007.77x = 3,006.78 × 1,389.74
4. Step 4: Simplify right side
   2,007.77x = 4,178,627.40
5. Step 5: Solve for x
   x = 4,178,627.40/2,007.77
6. Step 6: Final answer
   x = 2,081.23