Finding the Fourth Proportional to 1,047.50, 1,570.35 and 397.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.50 : 1,570.35 = 397.78 : x
2. Step 2: Convert to fraction form
   1,047.50/1,570.35 = 397.78/x
3. Step 3: Cross multiply
   1,047.50x = 1,570.35 × 397.78
4. Step 4: Simplify right side
   1,047.50x = 624,653.82
5. Step 5: Solve for x
   x = 624,653.82/1,047.50
6. Step 6: Final answer
   x = 596.33