Finding the Fourth Proportional to 208,042.56, 312,072.71 and 81,710.15

Step by Step Solution

1. Step 1: Write the proportion equation
   208,042.56 : 312,072.71 = 81,710.15 : x
2. Step 2: Convert to fraction form
   208,042.56/312,072.71 = 81,710.15/x
3. Step 3: Cross multiply
   208,042.56x = 312,072.71 × 81,710.15
4. Step 4: Simplify right side
   208,042.56x = 25,499,505,976.09
5. Step 5: Solve for x
   x = 25,499,505,976.09/208,042.56
6. Step 6: Final answer
   x = 122,568.70