Finding the Fourth Proportional to 139,799.49, 209,491.83 and 102,682.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,799.49 : 209,491.83 = 102,682.05 : x
2. Step 2: Convert to fraction form
   139,799.49/209,491.83 = 102,682.05/x
3. Step 3: Cross multiply
   139,799.49x = 209,491.83 × 102,682.05
4. Step 4: Simplify right side
   139,799.49x = 21,511,050,562.65
5. Step 5: Solve for x
   x = 21,511,050,562.65/139,799.49
6. Step 6: Final answer
   x = 153,870.74