Finding the Fourth Proportional to 139,409.42, 208,901.21 and 103,698.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,409.42 : 208,901.21 = 103,698.05 : x
2. Step 2: Convert to fraction form
   139,409.42/208,901.21 = 103,698.05/x
3. Step 3: Cross multiply
   139,409.42x = 208,901.21 × 103,698.05
4. Step 4: Simplify right side
   139,409.42x = 21,662,646,556.64
5. Step 5: Solve for x
   x = 21,662,646,556.64/139,409.42
6. Step 6: Final answer
   x = 155,388.69