Finding the Fourth Proportional to 2,128.32, 3,192.84 and 647.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.32 : 3,192.84 = 647.52 : x
2. Step 2: Convert to fraction form
   2,128.32/3,192.84 = 647.52/x
3. Step 3: Cross multiply
   2,128.32x = 3,192.84 × 647.52
4. Step 4: Simplify right side
   2,128.32x = 2,067,427.76
5. Step 5: Solve for x
   x = 2,067,427.76/2,128.32
6. Step 6: Final answer
   x = 971.39