Finding the Fourth Proportional to 1,111.43, 1,667.34 and 380.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.43 : 1,667.34 = 380.84 : x
2. Step 2: Convert to fraction form
   1,111.43/1,667.34 = 380.84/x
3. Step 3: Cross multiply
   1,111.43x = 1,667.34 × 380.84
4. Step 4: Simplify right side
   1,111.43x = 634,981.43
5. Step 5: Solve for x
   x = 634,981.43/1,111.43
6. Step 6: Final answer
   x = 571.32