Finding the Fourth Proportional to 1,181.41, 1,629.84 and 709.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,181.41 : 1,629.84 = 709.31 : x
2. Step 2: Convert to fraction form
   1,181.41/1,629.84 = 709.31/x
3. Step 3: Cross multiply
   1,181.41x = 1,629.84 × 709.31
4. Step 4: Simplify right side
   1,181.41x = 1,156,061.81
5. Step 5: Solve for x
   x = 1,156,061.81/1,181.41
6. Step 6: Final answer
   x = 978.55