Finding the Fourth Proportional to 1,397.70, 1,930.05 and 874.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.70 : 1,930.05 = 874.62 : x
2. Step 2: Convert to fraction form
   1,397.70/1,930.05 = 874.62/x
3. Step 3: Cross multiply
   1,397.70x = 1,930.05 × 874.62
4. Step 4: Simplify right side
   1,397.70x = 1,688,060.33
5. Step 5: Solve for x
   x = 1,688,060.33/1,397.70
6. Step 6: Final answer
   x = 1,207.74