Finding the Fourth Proportional to 1,111.62, 1,667.16 and 380.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.62 : 1,667.16 = 380.73 : x
2. Step 2: Convert to fraction form
   1,111.62/1,667.16 = 380.73/x
3. Step 3: Cross multiply
   1,111.62x = 1,667.16 × 380.73
4. Step 4: Simplify right side
   1,111.62x = 634,737.83
5. Step 5: Solve for x
   x = 634,737.83/1,111.62
6. Step 6: Final answer
   x = 571.00