Finding the Fourth Proportional to 139,009.84, 208,482.78 and 82,865.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,009.84 : 208,482.78 = 82,865.80 : x
2. Step 2: Convert to fraction form
   139,009.84/208,482.78 = 82,865.80/x
3. Step 3: Cross multiply
   139,009.84x = 208,482.78 × 82,865.80
4. Step 4: Simplify right side
   139,009.84x = 17,276,092,350.92
5. Step 5: Solve for x
   x = 17,276,092,350.92/139,009.84
6. Step 6: Final answer
   x = 124,279.64