Finding the Fourth Proportional to 1,069.72, 1,604.50 and 636.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.72 : 1,604.50 = 636.50 : x
2. Step 2: Convert to fraction form
   1,069.72/1,604.50 = 636.50/x
3. Step 3: Cross multiply
   1,069.72x = 1,604.50 × 636.50
4. Step 4: Simplify right side
   1,069.72x = 1,021,264.25
5. Step 5: Solve for x
   x = 1,021,264.25/1,069.72
6. Step 6: Final answer
   x = 954.70