Finding the Fourth Proportional to 1,868.79, 2,802.72 and 636.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.79 : 2,802.72 = 636.17 : x
2. Step 2: Convert to fraction form
   1,868.79/2,802.72 = 636.17/x
3. Step 3: Cross multiply
   1,868.79x = 2,802.72 × 636.17
4. Step 4: Simplify right side
   1,868.79x = 1,782,992.37
5. Step 5: Solve for x
   x = 1,782,992.37/1,868.79
6. Step 6: Final answer
   x = 954.09