Finding the Fourth Proportional to 1,111.06, 1,666.62 and 289.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.06 : 1,666.62 = 289.37 : x
2. Step 2: Convert to fraction form
   1,111.06/1,666.62 = 289.37/x
3. Step 3: Cross multiply
   1,111.06x = 1,666.62 × 289.37
4. Step 4: Simplify right side
   1,111.06x = 482,269.83
5. Step 5: Solve for x
   x = 482,269.83/1,111.06
6. Step 6: Final answer
   x = 434.06