Finding the Fourth Proportional to 1,438.33, 1,985.12 and 879.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.33 : 1,985.12 = 879.12 : x
2. Step 2: Convert to fraction form
   1,438.33/1,985.12 = 879.12/x
3. Step 3: Cross multiply
   1,438.33x = 1,985.12 × 879.12
4. Step 4: Simplify right side
   1,438.33x = 1,745,158.69
5. Step 5: Solve for x
   x = 1,745,158.69/1,438.33
6. Step 6: Final answer
   x = 1,213.32