Finding the Fourth Proportional to 1,052.79, 1,578.03 and 436.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,052.79 : 1,578.03 = 436.15 : x
2. Step 2: Convert to fraction form
   1,052.79/1,578.03 = 436.15/x
3. Step 3: Cross multiply
   1,052.79x = 1,578.03 × 436.15
4. Step 4: Simplify right side
   1,052.79x = 688,257.78
5. Step 5: Solve for x
   x = 688,257.78/1,052.79
6. Step 6: Final answer
   x = 653.75