Finding the Fourth Proportional to 1,377.84, 1,900.80 and 936.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.84 : 1,900.80 = 936.12 : x
2. Step 2: Convert to fraction form
   1,377.84/1,900.80 = 936.12/x
3. Step 3: Cross multiply
   1,377.84x = 1,900.80 × 936.12
4. Step 4: Simplify right side
   1,377.84x = 1,779,376.90
5. Step 5: Solve for x
   x = 1,779,376.90/1,377.84
6. Step 6: Final answer
   x = 1,291.42