Finding the Fourth Proportional to 139,134.42, 208,729.80 and 59,172.21

Step by Step Solution

1. Step 1: Write the proportion equation
   139,134.42 : 208,729.80 = 59,172.21 : x
2. Step 2: Convert to fraction form
   139,134.42/208,729.80 = 59,172.21/x
3. Step 3: Cross multiply
   139,134.42x = 208,729.80 × 59,172.21
4. Step 4: Simplify right side
   139,134.42x = 12,351,003,558.86
5. Step 5: Solve for x
   x = 12,351,003,558.86/139,134.42
6. Step 6: Final answer
   x = 88,770.30