Finding the Fourth Proportional to 2,109.09, 3,164.00 and 647.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.09 : 3,164.00 = 647.91 : x
2. Step 2: Convert to fraction form
   2,109.09/3,164.00 = 647.91/x
3. Step 3: Cross multiply
   2,109.09x = 3,164.00 × 647.91
4. Step 4: Simplify right side
   2,109.09x = 2,049,984.00
5. Step 5: Solve for x
   x = 2,049,984.00/2,109.09
6. Step 6: Final answer
   x = 971.98