Finding the Fourth Proportional to 3,181.78, 4,772.61 and 873.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,181.78 : 4,772.61 = 873.34 : x
2. Step 2: Convert to fraction form
   3,181.78/4,772.61 = 873.34/x
3. Step 3: Cross multiply
   3,181.78x = 4,772.61 × 873.34
4. Step 4: Simplify right side
   3,181.78x = 4,168,111.22
5. Step 5: Solve for x
   x = 4,168,111.22/3,181.78
6. Step 6: Final answer
   x = 1,309.99