Finding the Fourth Proportional to 1,405.85, 1,940.03 and 776.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.85 : 1,940.03 = 776.37 : x
2. Step 2: Convert to fraction form
   1,405.85/1,940.03 = 776.37/x
3. Step 3: Cross multiply
   1,405.85x = 1,940.03 × 776.37
4. Step 4: Simplify right side
   1,405.85x = 1,506,167.51
5. Step 5: Solve for x
   x = 1,506,167.51/1,405.85
6. Step 6: Final answer
   x = 1,071.36