Finding the Fourth Proportional to 1,587.39, 2,190.42 and 879.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,587.39 : 2,190.42 = 879.25 : x
2. Step 2: Convert to fraction form
   1,587.39/2,190.42 = 879.25/x
3. Step 3: Cross multiply
   1,587.39x = 2,190.42 × 879.25
4. Step 4: Simplify right side
   1,587.39x = 1,925,921.31
5. Step 5: Solve for x
   x = 1,925,921.31/1,587.39
6. Step 6: Final answer
   x = 1,213.26