Finding the Fourth Proportional to 139,796.48, 209,487.35 and 102,679.04

Step by Step Solution

1. Step 1: Write the proportion equation
   139,796.48 : 209,487.35 = 102,679.04 : x
2. Step 2: Convert to fraction form
   139,796.48/209,487.35 = 102,679.04/x
3. Step 3: Cross multiply
   139,796.48x = 209,487.35 × 102,679.04
4. Step 4: Simplify right side
   139,796.48x = 21,509,958,429.31
5. Step 5: Solve for x
   x = 21,509,958,429.31/139,796.48
6. Step 6: Final answer
   x = 153,866.24