Finding the Fourth Proportional to 139,809.21, 209,538.72 and 110,109.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139,809.21 : 209,538.72 = 110,109.75 : x
2. Step 2: Convert to fraction form
   139,809.21/209,538.72 = 110,109.75/x
3. Step 3: Cross multiply
   139,809.21x = 209,538.72 × 110,109.75
4. Step 4: Simplify right side
   139,809.21x = 23,072,256,074.52
5. Step 5: Solve for x
   x = 23,072,256,074.52/139,809.21
6. Step 6: Final answer
   x = 165,026.73