Finding the Fourth Proportional to 942.30, 1,405.89 and 838.35

Step by Step Solution

1. Step 1: Write the proportion equation
   942.30 : 1,405.89 = 838.35 : x
2. Step 2: Convert to fraction form
   942.30/1,405.89 = 838.35/x
3. Step 3: Cross multiply
   942.30x = 1,405.89 × 838.35
4. Step 4: Simplify right side
   942.30x = 1,178,627.88
5. Step 5: Solve for x
   x = 1,178,627.88/942.30
6. Step 6: Final answer
   x = 1,250.80