Finding the Fourth Proportional to 1,366.16, 1,885.08 and 776.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,366.16 : 1,885.08 = 776.72 : x
2. Step 2: Convert to fraction form
   1,366.16/1,885.08 = 776.72/x
3. Step 3: Cross multiply
   1,366.16x = 1,885.08 × 776.72
4. Step 4: Simplify right side
   1,366.16x = 1,464,179.34
5. Step 5: Solve for x
   x = 1,464,179.34/1,366.16
6. Step 6: Final answer
   x = 1,071.75