Finding the Fourth Proportional to 1,379.89, 1,904.24 and 750.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.89 : 1,904.24 = 750.40 : x
2. Step 2: Convert to fraction form
   1,379.89/1,904.24 = 750.40/x
3. Step 3: Cross multiply
   1,379.89x = 1,904.24 × 750.40
4. Step 4: Simplify right side
   1,379.89x = 1,428,941.70
5. Step 5: Solve for x
   x = 1,428,941.70/1,379.89
6. Step 6: Final answer
   x = 1,035.55