Finding the Fourth Proportional to 1,196.70, 1,651.47 and 672.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.70 : 1,651.47 = 672.78 : x
2. Step 2: Convert to fraction form
   1,196.70/1,651.47 = 672.78/x
3. Step 3: Cross multiply
   1,196.70x = 1,651.47 × 672.78
4. Step 4: Simplify right side
   1,196.70x = 1,111,075.99
5. Step 5: Solve for x
   x = 1,111,075.99/1,196.70
6. Step 6: Final answer
   x = 928.45