Finding the Fourth Proportional to 1,111.59, 1,533.99 and 669.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.59 : 1,533.99 = 669.40 : x
2. Step 2: Convert to fraction form
   1,111.59/1,533.99 = 669.40/x
3. Step 3: Cross multiply
   1,111.59x = 1,533.99 × 669.40
4. Step 4: Simplify right side
   1,111.59x = 1,026,852.91
5. Step 5: Solve for x
   x = 1,026,852.91/1,111.59
6. Step 6: Final answer
   x = 923.77