Finding the Fourth Proportional to 1,385.45, 2,076.06 and 864.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.45 : 2,076.06 = 864.07 : x
2. Step 2: Convert to fraction form
   1,385.45/2,076.06 = 864.07/x
3. Step 3: Cross multiply
   1,385.45x = 2,076.06 × 864.07
4. Step 4: Simplify right side
   1,385.45x = 1,793,851.92
5. Step 5: Solve for x
   x = 1,793,851.92/1,385.45
6. Step 6: Final answer
   x = 1,294.78