Finding the Fourth Proportional to 1,395.68, 1,925.96 and 774.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.68 : 1,925.96 = 774.72 : x
2. Step 2: Convert to fraction form
   1,395.68/1,925.96 = 774.72/x
3. Step 3: Cross multiply
   1,395.68x = 1,925.96 × 774.72
4. Step 4: Simplify right side
   1,395.68x = 1,492,079.73
5. Step 5: Solve for x
   x = 1,492,079.73/1,395.68
6. Step 6: Final answer
   x = 1,069.07