Finding the Fourth Proportional to 139,610.28, 209,412.69 and 39,771.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,610.28 : 209,412.69 = 39,771.12 : x
2. Step 2: Convert to fraction form
   139,610.28/209,412.69 = 39,771.12/x
3. Step 3: Cross multiply
   139,610.28x = 209,412.69 × 39,771.12
4. Step 4: Simplify right side
   139,610.28x = 8,328,577,223.51
5. Step 5: Solve for x
   x = 8,328,577,223.51/139,610.28
6. Step 6: Final answer
   x = 59,655.90