Finding the Fourth Proportional to 1,238.84, 1,857.89 and 545.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.84 : 1,857.89 = 545.38 : x
2. Step 2: Convert to fraction form
   1,238.84/1,857.89 = 545.38/x
3. Step 3: Cross multiply
   1,238.84x = 1,857.89 × 545.38
4. Step 4: Simplify right side
   1,238.84x = 1,013,260.15
5. Step 5: Solve for x
   x = 1,013,260.15/1,238.84
6. Step 6: Final answer
   x = 817.91