Finding the Fourth Proportional to 139,079.18, 208,526.60 and 50,321

Step by Step Solution

1. Step 1: Write the proportion equation
   139,079.18 : 208,526.60 = 50,321 : x
2. Step 2: Convert to fraction form
   139,079.18/208,526.60 = 50,321/x
3. Step 3: Cross multiply
   139,079.18x = 208,526.60 × 50,321
4. Step 4: Simplify right side
   139,079.18x = 10,493,267,038.60
5. Step 5: Solve for x
   x = 10,493,267,038.60/139,079.18
6. Step 6: Final answer
   x = 75,448.15