Finding the Fourth Proportional to 139,040.31, 208,549.53 and 39,196.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139,040.31 : 208,549.53 = 39,196.47 : x
2. Step 2: Convert to fraction form
   139,040.31/208,549.53 = 39,196.47/x
3. Step 3: Cross multiply
   139,040.31x = 208,549.53 × 39,196.47
4. Step 4: Simplify right side
   139,040.31x = 8,174,405,396.16
5. Step 5: Solve for x
   x = 8,174,405,396.16/139,040.31
6. Step 6: Final answer
   x = 58,791.62