Finding the Fourth Proportional to 1,379.49, 1,901.64 and 1,006.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.49 : 1,901.64 = 1,006.89 : x
2. Step 2: Convert to fraction form
   1,379.49/1,901.64 = 1,006.89/x
3. Step 3: Cross multiply
   1,379.49x = 1,901.64 × 1,006.89
4. Step 4: Simplify right side
   1,379.49x = 1,914,742.30
5. Step 5: Solve for x
   x = 1,914,742.30/1,379.49
6. Step 6: Final answer
   x = 1,388.01