Finding the Fourth Proportional to 289,300.98, 433,645.29 and 131,640.15

Step by Step Solution

1. Step 1: Write the proportion equation
   289,300.98 : 433,645.29 = 131,640.15 : x
2. Step 2: Convert to fraction form
   289,300.98/433,645.29 = 131,640.15/x
3. Step 3: Cross multiply
   289,300.98x = 433,645.29 × 131,640.15
4. Step 4: Simplify right side
   289,300.98x = 57,085,131,022.39
5. Step 5: Solve for x
   x = 57,085,131,022.39/289,300.98
6. Step 6: Final answer
   x = 197,320.90