Finding the Fourth Proportional to 933.50, 1,401.47 and 869.31

Step by Step Solution

1. Step 1: Write the proportion equation
   933.50 : 1,401.47 = 869.31 : x
2. Step 2: Convert to fraction form
   933.50/1,401.47 = 869.31/x
3. Step 3: Cross multiply
   933.50x = 1,401.47 × 869.31
4. Step 4: Simplify right side
   933.50x = 1,218,311.89
5. Step 5: Solve for x
   x = 1,218,311.89/933.50
6. Step 6: Final answer
   x = 1,305.10