Finding the Fourth Proportional to 139,406.76, 209,110.14 and 50,643.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,406.76 : 209,110.14 = 50,643.72 : x
2. Step 2: Convert to fraction form
   139,406.76/209,110.14 = 50,643.72/x
3. Step 3: Cross multiply
   139,406.76x = 209,110.14 × 50,643.72
4. Step 4: Simplify right side
   139,406.76x = 10,590,115,379.32
5. Step 5: Solve for x
   x = 10,590,115,379.32/139,406.76
6. Step 6: Final answer
   x = 75,965.58