Finding the Fourth Proportional to 1,274.46, 1,911.89 and 452.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,274.46 : 1,911.89 = 452.61 : x
2. Step 2: Convert to fraction form
   1,274.46/1,911.89 = 452.61/x
3. Step 3: Cross multiply
   1,274.46x = 1,911.89 × 452.61
4. Step 4: Simplify right side
   1,274.46x = 865,340.53
5. Step 5: Solve for x
   x = 865,340.53/1,274.46
6. Step 6: Final answer
   x = 678.99