Finding the Fourth Proportional to 1,386.34, 1,912.98 and 765.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.34 : 1,912.98 = 765.34 : x
2. Step 2: Convert to fraction form
   1,386.34/1,912.98 = 765.34/x
3. Step 3: Cross multiply
   1,386.34x = 1,912.98 × 765.34
4. Step 4: Simplify right side
   1,386.34x = 1,464,080.11
5. Step 5: Solve for x
   x = 1,464,080.11/1,386.34
6. Step 6: Final answer
   x = 1,056.08