Finding the Fourth Proportional to 1,365.99, 1,885.12 and 776.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,365.99 : 1,885.12 = 776.58 : x
2. Step 2: Convert to fraction form
   1,365.99/1,885.12 = 776.58/x
3. Step 3: Cross multiply
   1,365.99x = 1,885.12 × 776.58
4. Step 4: Simplify right side
   1,365.99x = 1,463,946.49
5. Step 5: Solve for x
   x = 1,463,946.49/1,365.99
6. Step 6: Final answer
   x = 1,071.71