Finding the Fourth Proportional to 1,181.74, 1,631.41 and 790.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,181.74 : 1,631.41 = 790.82 : x
2. Step 2: Convert to fraction form
   1,181.74/1,631.41 = 790.82/x
3. Step 3: Cross multiply
   1,181.74x = 1,631.41 × 790.82
4. Step 4: Simplify right side
   1,181.74x = 1,290,151.66
5. Step 5: Solve for x
   x = 1,290,151.66/1,181.74
6. Step 6: Final answer
   x = 1,091.74