Finding the Fourth Proportional to 1,253.17, 1,878.49 and 636.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,253.17 : 1,878.49 = 636.15 : x
2. Step 2: Convert to fraction form
   1,253.17/1,878.49 = 636.15/x
3. Step 3: Cross multiply
   1,253.17x = 1,878.49 × 636.15
4. Step 4: Simplify right side
   1,253.17x = 1,195,009.25
5. Step 5: Solve for x
   x = 1,195,009.25/1,253.17
6. Step 6: Final answer
   x = 953.59