Finding the Fourth Proportional to 1,390.24, 1,919.81 and 893.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.24 : 1,919.81 = 893.75 : x
2. Step 2: Convert to fraction form
   1,390.24/1,919.81 = 893.75/x
3. Step 3: Cross multiply
   1,390.24x = 1,919.81 × 893.75
4. Step 4: Simplify right side
   1,390.24x = 1,715,820.31
5. Step 5: Solve for x
   x = 1,715,820.31/1,390.24
6. Step 6: Final answer
   x = 1,234.19