Finding the Fourth Proportional to 1,128.89, 1,693.42 and 435.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.89 : 1,693.42 = 435.57 : x
2. Step 2: Convert to fraction form
   1,128.89/1,693.42 = 435.57/x
3. Step 3: Cross multiply
   1,128.89x = 1,693.42 × 435.57
4. Step 4: Simplify right side
   1,128.89x = 737,602.95
5. Step 5: Solve for x
   x = 737,602.95/1,128.89
6. Step 6: Final answer
   x = 653.39