Finding the Fourth Proportional to 1,128.72, 1,692.82 and 543.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.72 : 1,692.82 = 543.35 : x
2. Step 2: Convert to fraction form
   1,128.72/1,692.82 = 543.35/x
3. Step 3: Cross multiply
   1,128.72x = 1,692.82 × 543.35
4. Step 4: Simplify right side
   1,128.72x = 919,795.56
5. Step 5: Solve for x
   x = 919,795.56/1,128.72
6. Step 6: Final answer
   x = 814.90