Finding the Fourth Proportional to 139,528.44, 209,287.95 and 60,642.67

Step by Step Solution

1. Step 1: Write the proportion equation
   139,528.44 : 209,287.95 = 60,642.67 : x
2. Step 2: Convert to fraction form
   139,528.44/209,287.95 = 60,642.67/x
3. Step 3: Cross multiply
   139,528.44x = 209,287.95 × 60,642.67
4. Step 4: Simplify right side
   139,528.44x = 12,691,780,086.83
5. Step 5: Solve for x
   x = 12,691,780,086.83/139,528.44
6. Step 6: Final answer
   x = 90,961.96