Finding the Fourth Proportional to 139,009.34, 208,482.03 and 82,865.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,009.34 : 208,482.03 = 82,865.30 : x
2. Step 2: Convert to fraction form
   139,009.34/208,482.03 = 82,865.30/x
3. Step 3: Cross multiply
   139,009.34x = 208,482.03 × 82,865.30
4. Step 4: Simplify right side
   139,009.34x = 17,275,925,960.56
5. Step 5: Solve for x
   x = 17,275,925,960.56/139,009.34
6. Step 6: Final answer
   x = 124,278.89