Finding the Fourth Proportional to 1,047.60, 1,570.05 and 636.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.60 : 1,570.05 = 636.30 : x
2. Step 2: Convert to fraction form
   1,047.60/1,570.05 = 636.30/x
3. Step 3: Cross multiply
   1,047.60x = 1,570.05 × 636.30
4. Step 4: Simplify right side
   1,047.60x = 999,022.82
5. Step 5: Solve for x
   x = 999,022.82/1,047.60
6. Step 6: Final answer
   x = 953.63