Finding the Fourth Proportional to 139,409.76, 209,114.64 and 50,646.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,409.76 : 209,114.64 = 50,646.72 : x
2. Step 2: Convert to fraction form
   139,409.76/209,114.64 = 50,646.72/x
3. Step 3: Cross multiply
   139,409.76x = 209,114.64 × 50,646.72
4. Step 4: Simplify right side
   139,409.76x = 10,590,970,619.98
5. Step 5: Solve for x
   x = 10,590,970,619.98/139,409.76
6. Step 6: Final answer
   x = 75,970.08