Finding the Fourth Proportional to 1,222.37, 1,686.89 and 670.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.37 : 1,686.89 = 670.37 : x
2. Step 2: Convert to fraction form
   1,222.37/1,686.89 = 670.37/x
3. Step 3: Cross multiply
   1,222.37x = 1,686.89 × 670.37
4. Step 4: Simplify right side
   1,222.37x = 1,130,837.10
5. Step 5: Solve for x
   x = 1,130,837.10/1,222.37
6. Step 6: Final answer
   x = 925.12