Finding the Fourth Proportional to 139,738.47, 209,345.27 and 108,420.63

Step by Step Solution

1. Step 1: Write the proportion equation
   139,738.47 : 209,345.27 = 108,420.63 : x
2. Step 2: Convert to fraction form
   139,738.47/209,345.27 = 108,420.63/x
3. Step 3: Cross multiply
   139,738.47x = 209,345.27 × 108,420.63
4. Step 4: Simplify right side
   139,738.47x = 22,697,345,518.82
5. Step 5: Solve for x
   x = 22,697,345,518.82/139,738.47
6. Step 6: Final answer
   x = 162,427.32