Finding the Fourth Proportional to 208,145.09, 312,342.18 and 89,816.42

Step by Step Solution

1. Step 1: Write the proportion equation
   208,145.09 : 312,342.18 = 89,816.42 : x
2. Step 2: Convert to fraction form
   208,145.09/312,342.18 = 89,816.42/x
3. Step 3: Cross multiply
   208,145.09x = 312,342.18 × 89,816.42
4. Step 4: Simplify right side
   208,145.09x = 28,053,456,422.60
5. Step 5: Solve for x
   x = 28,053,456,422.60/208,145.09
6. Step 6: Final answer
   x = 134,778.37