Finding the Fourth Proportional to 1,306.91, 1,803.52 and 776.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,306.91 : 1,803.52 = 776.15 : x
2. Step 2: Convert to fraction form
   1,306.91/1,803.52 = 776.15/x
3. Step 3: Cross multiply
   1,306.91x = 1,803.52 × 776.15
4. Step 4: Simplify right side
   1,306.91x = 1,399,802.05
5. Step 5: Solve for x
   x = 1,399,802.05/1,306.91
6. Step 6: Final answer
   x = 1,071.08