Finding the Fourth Proportional to 1,395.55, 1,925.90 and 766.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.55 : 1,925.90 = 766.11 : x
2. Step 2: Convert to fraction form
   1,395.55/1,925.90 = 766.11/x
3. Step 3: Cross multiply
   1,395.55x = 1,925.90 × 766.11
4. Step 4: Simplify right side
   1,395.55x = 1,475,448.83
5. Step 5: Solve for x
   x = 1,475,448.83/1,395.55
6. Step 6: Final answer
   x = 1,057.25