Finding the Fourth Proportional to 193,300.61, 289,834.43 and 86,665.28

Step by Step Solution

1. Step 1: Write the proportion equation
   193,300.61 : 289,834.43 = 86,665.28 : x
2. Step 2: Convert to fraction form
   193,300.61/289,834.43 = 86,665.28/x
3. Step 3: Cross multiply
   193,300.61x = 289,834.43 × 86,665.28
4. Step 4: Simplify right side
   193,300.61x = 25,118,580,147.09
5. Step 5: Solve for x
   x = 25,118,580,147.09/193,300.61
6. Step 6: Final answer
   x = 129,945.69