Finding the Fourth Proportional to 1,379.32, 1,902.16 and 906.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.32 : 1,902.16 = 906.38 : x
2. Step 2: Convert to fraction form
   1,379.32/1,902.16 = 906.38/x
3. Step 3: Cross multiply
   1,379.32x = 1,902.16 × 906.38
4. Step 4: Simplify right side
   1,379.32x = 1,724,079.78
5. Step 5: Solve for x
   x = 1,724,079.78/1,379.32
6. Step 6: Final answer
   x = 1,249.95