Finding the Fourth Proportional to 1,942.88, 2,915.58 and 847.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,942.88 : 2,915.58 = 847.31 : x
2. Step 2: Convert to fraction form
   1,942.88/2,915.58 = 847.31/x
3. Step 3: Cross multiply
   1,942.88x = 2,915.58 × 847.31
4. Step 4: Simplify right side
   1,942.88x = 2,470,400.09
5. Step 5: Solve for x
   x = 2,470,400.09/1,942.88
6. Step 6: Final answer
   x = 1,271.51