Finding the Fourth Proportional to 1,221.30, 1,828.71 and 635.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,221.30 : 1,828.71 = 635.27 : x
2. Step 2: Convert to fraction form
   1,221.30/1,828.71 = 635.27/x
3. Step 3: Cross multiply
   1,221.30x = 1,828.71 × 635.27
4. Step 4: Simplify right side
   1,221.30x = 1,161,715.46
5. Step 5: Solve for x
   x = 1,161,715.46/1,221.30
6. Step 6: Final answer
   x = 951.21