Finding the Fourth Proportional to 1,379.02, 1,903.08 and 789.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.02 : 1,903.08 = 789.62 : x
2. Step 2: Convert to fraction form
   1,379.02/1,903.08 = 789.62/x
3. Step 3: Cross multiply
   1,379.02x = 1,903.08 × 789.62
4. Step 4: Simplify right side
   1,379.02x = 1,502,710.03
5. Step 5: Solve for x
   x = 1,502,710.03/1,379.02
6. Step 6: Final answer
   x = 1,089.69