Finding the Fourth Proportional to 1,111.46, 1,666.17 and 380.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.46 : 1,666.17 = 380.84 : x
2. Step 2: Convert to fraction form
   1,111.46/1,666.17 = 380.84/x
3. Step 3: Cross multiply
   1,111.46x = 1,666.17 × 380.84
4. Step 4: Simplify right side
   1,111.46x = 634,535.85
5. Step 5: Solve for x
   x = 634,535.85/1,111.46
6. Step 6: Final answer
   x = 570.91