Finding the Fourth Proportional to 1,403.90, 1,937.39 and 774.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.90 : 1,937.39 = 774.45 : x
2. Step 2: Convert to fraction form
   1,403.90/1,937.39 = 774.45/x
3. Step 3: Cross multiply
   1,403.90x = 1,937.39 × 774.45
4. Step 4: Simplify right side
   1,403.90x = 1,500,411.69
5. Step 5: Solve for x
   x = 1,500,411.69/1,403.90
6. Step 6: Final answer
   x = 1,068.75