Finding the Fourth Proportional to 1,128.45, 1,692.72 and 435.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.45 : 1,692.72 = 435.18 : x
2. Step 2: Convert to fraction form
   1,128.45/1,692.72 = 435.18/x
3. Step 3: Cross multiply
   1,128.45x = 1,692.72 × 435.18
4. Step 4: Simplify right side
   1,128.45x = 736,637.89
5. Step 5: Solve for x
   x = 736,637.89/1,128.45
6. Step 6: Final answer
   x = 652.79