Finding the Fourth Proportional to 1,128.31, 1,693.85 and 535.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.31 : 1,693.85 = 535.89 : x
2. Step 2: Convert to fraction form
   1,128.31/1,693.85 = 535.89/x
3. Step 3: Cross multiply
   1,128.31x = 1,693.85 × 535.89
4. Step 4: Simplify right side
   1,128.31x = 907,720.95
5. Step 5: Solve for x
   x = 907,720.95/1,128.31
6. Step 6: Final answer
   x = 804.50