Finding the Fourth Proportional to 2,912.30, 4,367.84 and 938.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,912.30 : 4,367.84 = 938.11 : x
2. Step 2: Convert to fraction form
   2,912.30/4,367.84 = 938.11/x
3. Step 3: Cross multiply
   2,912.30x = 4,367.84 × 938.11
4. Step 4: Simplify right side
   2,912.30x = 4,097,499.95
5. Step 5: Solve for x
   x = 4,097,499.95/2,912.30
6. Step 6: Final answer
   x = 1,406.96