Finding the Fourth Proportional to 1,111.73, 1,667.45 and 290.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.73 : 1,667.45 = 290.00 : x
2. Step 2: Convert to fraction form
   1,111.73/1,667.45 = 290.00/x
3. Step 3: Cross multiply
   1,111.73x = 1,667.45 × 290.00
4. Step 4: Simplify right side
   1,111.73x = 483,550.71
5. Step 5: Solve for x
   x = 483,550.71/1,111.73
6. Step 6: Final answer
   x = 434.96