Finding the Fourth Proportional to 1,868.42, 2,802.72 and 635.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.42 : 2,802.72 = 635.78 : x
2. Step 2: Convert to fraction form
   1,868.42/2,802.72 = 635.78/x
3. Step 3: Cross multiply
   1,868.42x = 2,802.72 × 635.78
4. Step 4: Simplify right side
   1,868.42x = 1,781,913.32
5. Step 5: Solve for x
   x = 1,781,913.32/1,868.42
6. Step 6: Final answer
   x = 953.70