Finding the Fourth Proportional to 1,245.34, 1,866.17 and 697.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.34 : 1,866.17 = 697.69 : x
2. Step 2: Convert to fraction form
   1,245.34/1,866.17 = 697.69/x
3. Step 3: Cross multiply
   1,245.34x = 1,866.17 × 697.69
4. Step 4: Simplify right side
   1,245.34x = 1,302,005.23
5. Step 5: Solve for x
   x = 1,302,005.23/1,245.34
6. Step 6: Final answer
   x = 1,045.50