Finding the Fourth Proportional to 139,984.47, 210,018.60 and 45,229.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,984.47 : 210,018.60 = 45,229.55 : x
2. Step 2: Convert to fraction form
   139,984.47/210,018.60 = 45,229.55/x
3. Step 3: Cross multiply
   139,984.47x = 210,018.60 × 45,229.55
4. Step 4: Simplify right side
   139,984.47x = 9,499,045,719.54
5. Step 5: Solve for x
   x = 9,499,045,719.54/139,984.47
6. Step 6: Final answer
   x = 67,857.85