Finding the Fourth Proportional to 1,258.79, 1,735.17 and 1,072.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.79 : 1,735.17 = 1,072.22 : x
2. Step 2: Convert to fraction form
   1,258.79/1,735.17 = 1,072.22/x
3. Step 3: Cross multiply
   1,258.79x = 1,735.17 × 1,072.22
4. Step 4: Simplify right side
   1,258.79x = 1,860,475.30
5. Step 5: Solve for x
   x = 1,860,475.30/1,258.79
6. Step 6: Final answer
   x = 1,477.99