Finding the Fourth Proportional to 1,111.15, 1,666.82 and 289.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.15 : 1,666.82 = 289.42 : x
2. Step 2: Convert to fraction form
   1,111.15/1,666.82 = 289.42/x
3. Step 3: Cross multiply
   1,111.15x = 1,666.82 × 289.42
4. Step 4: Simplify right side
   1,111.15x = 482,409.60
5. Step 5: Solve for x
   x = 482,409.60/1,111.15
6. Step 6: Final answer
   x = 434.16