Finding the Fourth Proportional to 1,294.91, 1,787.27 and 790.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,294.91 : 1,787.27 = 790.89 : x
2. Step 2: Convert to fraction form
   1,294.91/1,787.27 = 790.89/x
3. Step 3: Cross multiply
   1,294.91x = 1,787.27 × 790.89
4. Step 4: Simplify right side
   1,294.91x = 1,413,528.34
5. Step 5: Solve for x
   x = 1,413,528.34/1,294.91
6. Step 6: Final answer
   x = 1,091.60