Finding the Fourth Proportional to 139,801.50, 209,494.82 and 102,684.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139,801.50 : 209,494.82 = 102,684.06 : x
2. Step 2: Convert to fraction form
   139,801.50/209,494.82 = 102,684.06/x
3. Step 3: Cross multiply
   139,801.50x = 209,494.82 × 102,684.06
4. Step 4: Simplify right side
   139,801.50x = 21,511,778,666.57
5. Step 5: Solve for x
   x = 21,511,778,666.57/139,801.50
6. Step 6: Final answer
   x = 153,873.73