Finding the Fourth Proportional to 1,238.18, 1,857.33 and 890.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.18 : 1,857.33 = 890.55 : x
2. Step 2: Convert to fraction form
   1,238.18/1,857.33 = 890.55/x
3. Step 3: Cross multiply
   1,238.18x = 1,857.33 × 890.55
4. Step 4: Simplify right side
   1,238.18x = 1,654,045.23
5. Step 5: Solve for x
   x = 1,654,045.23/1,238.18
6. Step 6: Final answer
   x = 1,335.87