Finding the Fourth Proportional to 1,279.31, 1,922.63 and 630.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.31 : 1,922.63 = 630.50 : x
2. Step 2: Convert to fraction form
   1,279.31/1,922.63 = 630.50/x
3. Step 3: Cross multiply
   1,279.31x = 1,922.63 × 630.50
4. Step 4: Simplify right side
   1,279.31x = 1,212,205.45
5. Step 5: Solve for x
   x = 1,212,205.45/1,279.31
6. Step 6: Final answer
   x = 947.55