Finding the Fourth Proportional to 107,645.89, 161,435.99 and 86,535.87

Step by Step Solution

1. Step 1: Write the proportion equation
   107,645.89 : 161,435.99 = 86,535.87 : x
2. Step 2: Convert to fraction form
   107,645.89/161,435.99 = 86,535.87/x
3. Step 3: Cross multiply
   107,645.89x = 161,435.99 × 86,535.87
4. Step 4: Simplify right side
   107,645.89x = 13,970,003,843.96
5. Step 5: Solve for x
   x = 13,970,003,843.96/107,645.89
6. Step 6: Final answer
   x = 129,777.40