Finding the Fourth Proportional to 1,111.83, 1,667.58 and 290.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.83 : 1,667.58 = 290.16 : x
2. Step 2: Convert to fraction form
   1,111.83/1,667.58 = 290.16/x
3. Step 3: Cross multiply
   1,111.83x = 1,667.58 × 290.16
4. Step 4: Simplify right side
   1,111.83x = 483,865.01
5. Step 5: Solve for x
   x = 483,865.01/1,111.83
6. Step 6: Final answer
   x = 435.20