Finding the Fourth Proportional to 1,587.31, 2,190.45 and 888.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,587.31 : 2,190.45 = 888.82 : x
2. Step 2: Convert to fraction form
   1,587.31/2,190.45 = 888.82/x
3. Step 3: Cross multiply
   1,587.31x = 2,190.45 × 888.82
4. Step 4: Simplify right side
   1,587.31x = 1,946,915.77
5. Step 5: Solve for x
   x = 1,946,915.77/1,587.31
6. Step 6: Final answer
   x = 1,226.55