Finding the Fourth Proportional to 139,526.06, 209,284.41 and 60,640.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,526.06 : 209,284.41 = 60,640.28 : x
2. Step 2: Convert to fraction form
   139,526.06/209,284.41 = 60,640.28/x
3. Step 3: Cross multiply
   139,526.06x = 209,284.41 × 60,640.28
4. Step 4: Simplify right side
   139,526.06x = 12,691,065,222.03
5. Step 5: Solve for x
   x = 12,691,065,222.03/139,526.06
6. Step 6: Final answer
   x = 90,958.39