Finding the Fourth Proportional to 139,931.10, 209,895.61 and 40,091.38

Step by Step Solution

1. Step 1: Write the proportion equation
   139,931.10 : 209,895.61 = 40,091.38 : x
2. Step 2: Convert to fraction form
   139,931.10/209,895.61 = 40,091.38/x
3. Step 3: Cross multiply
   139,931.10x = 209,895.61 × 40,091.38
4. Step 4: Simplify right side
   139,931.10x = 8,415,004,898.15
5. Step 5: Solve for x
   x = 8,415,004,898.15/139,931.10
6. Step 6: Final answer
   x = 60,136.77