Finding the Fourth Proportional to 1,405.95, 1,940.18 and 776.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.95 : 1,940.18 = 776.47 : x
2. Step 2: Convert to fraction form
   1,405.95/1,940.18 = 776.47/x
3. Step 3: Cross multiply
   1,405.95x = 1,940.18 × 776.47
4. Step 4: Simplify right side
   1,405.95x = 1,506,485.74
5. Step 5: Solve for x
   x = 1,506,485.74/1,405.95
6. Step 6: Final answer
   x = 1,071.50