Finding the Fourth Proportional to 1,355.89, 1,872.45 and 1,158.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.89 : 1,872.45 = 1,158.25 : x
2. Step 2: Convert to fraction form
   1,355.89/1,872.45 = 1,158.25/x
3. Step 3: Cross multiply
   1,355.89x = 1,872.45 × 1,158.25
4. Step 4: Simplify right side
   1,355.89x = 2,168,750.06
5. Step 5: Solve for x
   x = 2,168,750.06/1,355.89
6. Step 6: Final answer
   x = 1,599.51