Finding the Fourth Proportional to 1,398.02, 1,930.10 and 874.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.02 : 1,930.10 = 874.76 : x
2. Step 2: Convert to fraction form
   1,398.02/1,930.10 = 874.76/x
3. Step 3: Cross multiply
   1,398.02x = 1,930.10 × 874.76
4. Step 4: Simplify right side
   1,398.02x = 1,688,360.25
5. Step 5: Solve for x
   x = 1,688,360.25/1,398.02
6. Step 6: Final answer
   x = 1,207.68