Finding the Fourth Proportional to 847.89, 1,174.39 and 784.71

Step by Step Solution

1. Step 1: Write the proportion equation
   847.89 : 1,174.39 = 784.71 : x
2. Step 2: Convert to fraction form
   847.89/1,174.39 = 784.71/x
3. Step 3: Cross multiply
   847.89x = 1,174.39 × 784.71
4. Step 4: Simplify right side
   847.89x = 921,553.62
5. Step 5: Solve for x
   x = 921,553.62/847.89
6. Step 6: Final answer
   x = 1,086.88