Finding the Fourth Proportional to 139,737.24, 209,637 and 50,990.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,737.24 : 209,637 = 50,990.76 : x
2. Step 2: Convert to fraction form
   139,737.24/209,637 = 50,990.76/x
3. Step 3: Cross multiply
   139,737.24x = 209,637 × 50,990.76
4. Step 4: Simplify right side
   139,737.24x = 10,689,549,954.12
5. Step 5: Solve for x
   x = 10,689,549,954.12/139,737.24
6. Step 6: Final answer
   x = 76,497.50