Finding the Fourth Proportional to 1,111.88, 1,667.82 and 290.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.88 : 1,667.82 = 290.15 : x
2. Step 2: Convert to fraction form
   1,111.88/1,667.82 = 290.15/x
3. Step 3: Cross multiply
   1,111.88x = 1,667.82 × 290.15
4. Step 4: Simplify right side
   1,111.88x = 483,917.25
5. Step 5: Solve for x
   x = 483,917.25/1,111.88
6. Step 6: Final answer
   x = 435.23