Finding the Fourth Proportional to 1,647.20, 2,272.91 and 948.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,647.20 : 2,272.91 = 948.57 : x
2. Step 2: Convert to fraction form
   1,647.20/2,272.91 = 948.57/x
3. Step 3: Cross multiply
   1,647.20x = 2,272.91 × 948.57
4. Step 4: Simplify right side
   1,647.20x = 2,156,009.50
5. Step 5: Solve for x
   x = 2,156,009.50/1,647.20
6. Step 6: Final answer
   x = 1,308.90