Finding the Fourth Proportional to 1,230.38, 1,697.87 and 670.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,230.38 : 1,697.87 = 670.83 : x
2. Step 2: Convert to fraction form
   1,230.38/1,697.87 = 670.83/x
3. Step 3: Cross multiply
   1,230.38x = 1,697.87 × 670.83
4. Step 4: Simplify right side
   1,230.38x = 1,138,978.78
5. Step 5: Solve for x
   x = 1,138,978.78/1,230.38
6. Step 6: Final answer
   x = 925.72