Finding the Fourth Proportional to 2,127.50, 3,191.25 and 646.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,127.50 : 3,191.25 = 646.73 : x
2. Step 2: Convert to fraction form
   2,127.50/3,191.25 = 646.73/x
3. Step 3: Cross multiply
   2,127.50x = 3,191.25 × 646.73
4. Step 4: Simplify right side
   2,127.50x = 2,063,873.88
5. Step 5: Solve for x
   x = 2,063,873.88/2,127.50
6. Step 6: Final answer
   x = 970.10