Finding the Fourth Proportional to 1,017.78, 1,526.55 and 454.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.78 : 1,526.55 = 454.98 : x
2. Step 2: Convert to fraction form
   1,017.78/1,526.55 = 454.98/x
3. Step 3: Cross multiply
   1,017.78x = 1,526.55 × 454.98
4. Step 4: Simplify right side
   1,017.78x = 694,549.72
5. Step 5: Solve for x
   x = 694,549.72/1,017.78
6. Step 6: Final answer
   x = 682.42