Finding the Fourth Proportional to 1,366.18, 1,885.34 and 776.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,366.18 : 1,885.34 = 776.72 : x
2. Step 2: Convert to fraction form
   1,366.18/1,885.34 = 776.72/x
3. Step 3: Cross multiply
   1,366.18x = 1,885.34 × 776.72
4. Step 4: Simplify right side
   1,366.18x = 1,464,381.28
5. Step 5: Solve for x
   x = 1,464,381.28/1,366.18
6. Step 6: Final answer
   x = 1,071.88