Finding the Fourth Proportional to 1,355.21, 1,870.18 and 734.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.21 : 1,870.18 = 734.21 : x
2. Step 2: Convert to fraction form
   1,355.21/1,870.18 = 734.21/x
3. Step 3: Cross multiply
   1,355.21x = 1,870.18 × 734.21
4. Step 4: Simplify right side
   1,355.21x = 1,373,100.68
5. Step 5: Solve for x
   x = 1,373,100.68/1,355.21
6. Step 6: Final answer
   x = 1,013.20