Finding the Fourth Proportional to 1,372.86, 1,896.20 and 999.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.86 : 1,896.20 = 999.25 : x
2. Step 2: Convert to fraction form
   1,372.86/1,896.20 = 999.25/x
3. Step 3: Cross multiply
   1,372.86x = 1,896.20 × 999.25
4. Step 4: Simplify right side
   1,372.86x = 1,894,777.85
5. Step 5: Solve for x
   x = 1,894,777.85/1,372.86
6. Step 6: Final answer
   x = 1,380.17