Finding the Fourth Proportional to 399,196.68, 598,665.42 and 132,885.69

Step by Step Solution

1. Step 1: Write the proportion equation
   399,196.68 : 598,665.42 = 132,885.69 : x
2. Step 2: Convert to fraction form
   399,196.68/598,665.42 = 132,885.69/x
3. Step 3: Cross multiply
   399,196.68x = 598,665.42 × 132,885.69
4. Step 4: Simplify right side
   399,196.68x = 79,554,067,415.84
5. Step 5: Solve for x
   x = 79,554,067,415.84/399,196.68
6. Step 6: Final answer
   x = 199,285.39