Finding the Fourth Proportional to 1,212.27, 1,672.50 and 770.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.27 : 1,672.50 = 770.10 : x
2. Step 2: Convert to fraction form
   1,212.27/1,672.50 = 770.10/x
3. Step 3: Cross multiply
   1,212.27x = 1,672.50 × 770.10
4. Step 4: Simplify right side
   1,212.27x = 1,287,992.25
5. Step 5: Solve for x
   x = 1,287,992.25/1,212.27
6. Step 6: Final answer
   x = 1,062.46