Finding the Fourth Proportional to 139,968.10, 209,952.15 and 100,602.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,968.10 : 209,952.15 = 100,602.10 : x
2. Step 2: Convert to fraction form
   139,968.10/209,952.15 = 100,602.10/x
3. Step 3: Cross multiply
   139,968.10x = 209,952.15 × 100,602.10
4. Step 4: Simplify right side
   139,968.10x = 21,121,627,189.52
5. Step 5: Solve for x
   x = 21,121,627,189.52/139,968.10
6. Step 6: Final answer
   x = 150,903.15