Finding the Fourth Proportional to 1,405.62, 1,939.74 and 776.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.62 : 1,939.74 = 776.07 : x
2. Step 2: Convert to fraction form
   1,405.62/1,939.74 = 776.07/x
3. Step 3: Cross multiply
   1,405.62x = 1,939.74 × 776.07
4. Step 4: Simplify right side
   1,405.62x = 1,505,374.02
5. Step 5: Solve for x
   x = 1,505,374.02/1,405.62
6. Step 6: Final answer
   x = 1,070.97