Finding the Fourth Proportional to 139,433.13, 209,112.33 and 60,528.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,433.13 : 209,112.33 = 60,528.60 : x
2. Step 2: Convert to fraction form
   139,433.13/209,112.33 = 60,528.60/x
3. Step 3: Cross multiply
   139,433.13x = 209,112.33 × 60,528.60
4. Step 4: Simplify right side
   139,433.13x = 12,657,275,229.43
5. Step 5: Solve for x
   x = 12,657,275,229.43/139,433.13
6. Step 6: Final answer
   x = 90,776.67