Finding the Fourth Proportional to 1,217.91, 1,818.09 and 1,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.91 : 1,818.09 = 1,164.72 : x
2. Step 2: Convert to fraction form
   1,217.91/1,818.09 = 1,164.72/x
3. Step 3: Cross multiply
   1,217.91x = 1,818.09 × 1,164.72
4. Step 4: Simplify right side
   1,217.91x = 2,117,565.78
5. Step 5: Solve for x
   x = 2,117,565.78/1,217.91
6. Step 6: Final answer
   x = 1,738.69