Finding the Fourth Proportional to 82,131.08, 123,404.21 and 78,809.58

Step by Step Solution

1. Step 1: Write the proportion equation
   82,131.08 : 123,404.21 = 78,809.58 : x
2. Step 2: Convert to fraction form
   82,131.08/123,404.21 = 78,809.58/x
3. Step 3: Cross multiply
   82,131.08x = 123,404.21 × 78,809.58
4. Step 4: Simplify right side
   82,131.08x = 9,725,433,566.28
5. Step 5: Solve for x
   x = 9,725,433,566.28/82,131.08
6. Step 6: Final answer
   x = 118,413.57