Finding the Fourth Proportional to 1,397.86, 1,928.51 and 874.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.86 : 1,928.51 = 874.19 : x
2. Step 2: Convert to fraction form
   1,397.86/1,928.51 = 874.19/x
3. Step 3: Cross multiply
   1,397.86x = 1,928.51 × 874.19
4. Step 4: Simplify right side
   1,397.86x = 1,685,887.89
5. Step 5: Solve for x
   x = 1,685,887.89/1,397.86
6. Step 6: Final answer
   x = 1,206.05