Finding the Fourth Proportional to 1,158.83, 1,737.38 and 428.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.83 : 1,737.38 = 428.27 : x
2. Step 2: Convert to fraction form
   1,158.83/1,737.38 = 428.27/x
3. Step 3: Cross multiply
   1,158.83x = 1,737.38 × 428.27
4. Step 4: Simplify right side
   1,158.83x = 744,056.90
5. Step 5: Solve for x
   x = 744,056.90/1,158.83
6. Step 6: Final answer
   x = 642.08