Finding the Fourth Proportional to 186,196.69, 279,076.32 and 86,145.57

Step by Step Solution

1. Step 1: Write the proportion equation
   186,196.69 : 279,076.32 = 86,145.57 : x
2. Step 2: Convert to fraction form
   186,196.69/279,076.32 = 86,145.57/x
3. Step 3: Cross multiply
   186,196.69x = 279,076.32 × 86,145.57
4. Step 4: Simplify right side
   186,196.69x = 24,041,188,659.90
5. Step 5: Solve for x
   x = 24,041,188,659.90/186,196.69
6. Step 6: Final answer
   x = 129,117.16