Finding the Fourth Proportional to 1,196.19, 1,792.35 and 648.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.19 : 1,792.35 = 648.63 : x
2. Step 2: Convert to fraction form
   1,196.19/1,792.35 = 648.63/x
3. Step 3: Cross multiply
   1,196.19x = 1,792.35 × 648.63
4. Step 4: Simplify right side
   1,196.19x = 1,162,571.98
5. Step 5: Solve for x
   x = 1,162,571.98/1,196.19
6. Step 6: Final answer
   x = 971.90