Finding the Fourth Proportional to 431,498.51, 647,273.71 and 131,981.68

Step by Step Solution

1. Step 1: Write the proportion equation
   431,498.51 : 647,273.71 = 131,981.68 : x
2. Step 2: Convert to fraction form
   431,498.51/647,273.71 = 131,981.68/x
3. Step 3: Cross multiply
   431,498.51x = 647,273.71 × 131,981.68
4. Step 4: Simplify right side
   431,498.51x = 85,428,275,379.27
5. Step 5: Solve for x
   x = 85,428,275,379.27/431,498.51
6. Step 6: Final answer
   x = 197,980.46