Finding the Fourth Proportional to 139,532.10, 209,298.15 and 100,166.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,532.10 : 209,298.15 = 100,166.10 : x
2. Step 2: Convert to fraction form
   139,532.10/209,298.15 = 100,166.10/x
3. Step 3: Cross multiply
   139,532.10x = 209,298.15 × 100,166.10
4. Step 4: Simplify right side
   139,532.10x = 20,964,579,422.72
5. Step 5: Solve for x
   x = 20,964,579,422.72/139,532.10
6. Step 6: Final answer
   x = 150,249.15