Finding the Fourth Proportional to 1,111.07, 1,666.59 and 289.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.07 : 1,666.59 = 289.34 : x
2. Step 2: Convert to fraction form
   1,111.07/1,666.59 = 289.34/x
3. Step 3: Cross multiply
   1,111.07x = 1,666.59 × 289.34
4. Step 4: Simplify right side
   1,111.07x = 482,202.82
5. Step 5: Solve for x
   x = 482,202.82/1,111.07
6. Step 6: Final answer
   x = 434.00