Finding the Fourth Proportional to 1,359.69, 1,878.09 and 1,006.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.69 : 1,878.09 = 1,006.12 : x
2. Step 2: Convert to fraction form
   1,359.69/1,878.09 = 1,006.12/x
3. Step 3: Cross multiply
   1,359.69x = 1,878.09 × 1,006.12
4. Step 4: Simplify right side
   1,359.69x = 1,889,582.49
5. Step 5: Solve for x
   x = 1,889,582.49/1,359.69
6. Step 6: Final answer
   x = 1,389.72