Finding the Fourth Proportional to 1,011.99, 1,387.83 and 969.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.99 : 1,387.83 = 969.89 : x
2. Step 2: Convert to fraction form
   1,011.99/1,387.83 = 969.89/x
3. Step 3: Cross multiply
   1,011.99x = 1,387.83 × 969.89
4. Step 4: Simplify right side
   1,011.99x = 1,346,046.94
5. Step 5: Solve for x
   x = 1,346,046.94/1,011.99
6. Step 6: Final answer
   x = 1,330.09