Finding the Fourth Proportional to 1,438.30, 2,155.59 and 604.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.30 : 2,155.59 = 604.42 : x
2. Step 2: Convert to fraction form
   1,438.30/2,155.59 = 604.42/x
3. Step 3: Cross multiply
   1,438.30x = 2,155.59 × 604.42
4. Step 4: Simplify right side
   1,438.30x = 1,302,881.71
5. Step 5: Solve for x
   x = 1,302,881.71/1,438.30
6. Step 6: Final answer
   x = 905.85