Finding the Fourth Proportional to 1,166.35, 1,609.29 and 1,018.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,166.35 : 1,609.29 = 1,018.72 : x
2. Step 2: Convert to fraction form
   1,166.35/1,609.29 = 1,018.72/x
3. Step 3: Cross multiply
   1,166.35x = 1,609.29 × 1,018.72
4. Step 4: Simplify right side
   1,166.35x = 1,639,415.91
5. Step 5: Solve for x
   x = 1,639,415.91/1,166.35
6. Step 6: Final answer
   x = 1,405.60