Finding the Fourth Proportional to 1,061.91, 1,590.84 and 818.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.91 : 1,590.84 = 818.51 : x
2. Step 2: Convert to fraction form
   1,061.91/1,590.84 = 818.51/x
3. Step 3: Cross multiply
   1,061.91x = 1,590.84 × 818.51
4. Step 4: Simplify right side
   1,061.91x = 1,302,110.49
5. Step 5: Solve for x
   x = 1,302,110.49/1,061.91
6. Step 6: Final answer
   x = 1,226.20