Finding the Fourth Proportional to 1,423.86, 1,965.02 and 864.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.86 : 1,965.02 = 864.35 : x
2. Step 2: Convert to fraction form
   1,423.86/1,965.02 = 864.35/x
3. Step 3: Cross multiply
   1,423.86x = 1,965.02 × 864.35
4. Step 4: Simplify right side
   1,423.86x = 1,698,450.89
5. Step 5: Solve for x
   x = 1,698,450.89/1,423.86
6. Step 6: Final answer
   x = 1,192.85