Finding the Fourth Proportional to 1,942.72, 2,915.34 and 788.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,942.72 : 2,915.34 = 788.56 : x
2. Step 2: Convert to fraction form
   1,942.72/2,915.34 = 788.56/x
3. Step 3: Cross multiply
   1,942.72x = 2,915.34 × 788.56
4. Step 4: Simplify right side
   1,942.72x = 2,298,920.51
5. Step 5: Solve for x
   x = 2,298,920.51/1,942.72
6. Step 6: Final answer
   x = 1,183.35