Finding the Fourth Proportional to 1,085.98, 1,499.23 and 838.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.98 : 1,499.23 = 838.58 : x
2. Step 2: Convert to fraction form
   1,085.98/1,499.23 = 838.58/x
3. Step 3: Cross multiply
   1,085.98x = 1,499.23 × 838.58
4. Step 4: Simplify right side
   1,085.98x = 1,257,224.42
5. Step 5: Solve for x
   x = 1,257,224.42/1,085.98
6. Step 6: Final answer
   x = 1,157.68