Finding the Fourth Proportional to 1,111.22, 1,666.84 and 380.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.22 : 1,666.84 = 380.82 : x
2. Step 2: Convert to fraction form
   1,111.22/1,666.84 = 380.82/x
3. Step 3: Cross multiply
   1,111.22x = 1,666.84 × 380.82
4. Step 4: Simplify right side
   1,111.22x = 634,766.01
5. Step 5: Solve for x
   x = 634,766.01/1,111.22
6. Step 6: Final answer
   x = 571.23