Finding the Fourth Proportional to 139,056.50, 208,591.23 and 40,560.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,056.50 : 208,591.23 = 40,560.50 : x
2. Step 2: Convert to fraction form
   139,056.50/208,591.23 = 40,560.50/x
3. Step 3: Cross multiply
   139,056.50x = 208,591.23 × 40,560.50
4. Step 4: Simplify right side
   139,056.50x = 8,460,564,584.42
5. Step 5: Solve for x
   x = 8,460,564,584.42/139,056.50
6. Step 6: Final answer
   x = 60,842.64