Finding the Fourth Proportional to 1,379.91, 1,904.78 and 914.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.91 : 1,904.78 = 914.31 : x
2. Step 2: Convert to fraction form
   1,379.91/1,904.78 = 914.31/x
3. Step 3: Cross multiply
   1,379.91x = 1,904.78 × 914.31
4. Step 4: Simplify right side
   1,379.91x = 1,741,554.83
5. Step 5: Solve for x
   x = 1,741,554.83/1,379.91
6. Step 6: Final answer
   x = 1,262.08