Finding the Fourth Proportional to 1,403.88, 1,937.28 and 774.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.88 : 1,937.28 = 774.48 : x
2. Step 2: Convert to fraction form
   1,403.88/1,937.28 = 774.48/x
3. Step 3: Cross multiply
   1,403.88x = 1,937.28 × 774.48
4. Step 4: Simplify right side
   1,403.88x = 1,500,384.61
5. Step 5: Solve for x
   x = 1,500,384.61/1,403.88
6. Step 6: Final answer
   x = 1,068.74