Finding the Fourth Proportional to 1,002.80, 1,501.47 and 847.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.80 : 1,501.47 = 847.89 : x
2. Step 2: Convert to fraction form
   1,002.80/1,501.47 = 847.89/x
3. Step 3: Cross multiply
   1,002.80x = 1,501.47 × 847.89
4. Step 4: Simplify right side
   1,002.80x = 1,273,081.40
5. Step 5: Solve for x
   x = 1,273,081.40/1,002.80
6. Step 6: Final answer
   x = 1,269.52