Finding the Fourth Proportional to 151,687.78, 209,329.76 and 83,706.75

Step by Step Solution

1. Step 1: Write the proportion equation
   151,687.78 : 209,329.76 = 83,706.75 : x
2. Step 2: Convert to fraction form
   151,687.78/209,329.76 = 83,706.75/x
3. Step 3: Cross multiply
   151,687.78x = 209,329.76 × 83,706.75
4. Step 4: Simplify right side
   151,687.78x = 17,522,314,097.15
5. Step 5: Solve for x
   x = 17,522,314,097.15/151,687.78
6. Step 6: Final answer
   x = 115,515.66