Finding the Fourth Proportional to 139,205.45, 208,539.12 and 83,090.27

Step by Step Solution

1. Step 1: Write the proportion equation
   139,205.45 : 208,539.12 = 83,090.27 : x
2. Step 2: Convert to fraction form
   139,205.45/208,539.12 = 83,090.27/x
3. Step 3: Cross multiply
   139,205.45x = 208,539.12 × 83,090.27
4. Step 4: Simplify right side
   139,205.45x = 17,327,572,619.30
5. Step 5: Solve for x
   x = 17,327,572,619.30/139,205.45
6. Step 6: Final answer
   x = 124,474.81