Finding the Fourth Proportional to 139,020.84, 208,499.28 and 82,876.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,020.84 : 208,499.28 = 82,876.80 : x
2. Step 2: Convert to fraction form
   139,020.84/208,499.28 = 82,876.80/x
3. Step 3: Cross multiply
   139,020.84x = 208,499.28 × 82,876.80
4. Step 4: Simplify right side
   139,020.84x = 17,279,753,128.70
5. Step 5: Solve for x
   x = 17,279,753,128.70/139,020.84
6. Step 6: Final answer
   x = 124,296.14