Finding the Fourth Proportional to 139,306.89, 208,986.59 and 63,411.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139,306.89 : 208,986.59 = 63,411.31 : x
2. Step 2: Convert to fraction form
   139,306.89/208,986.59 = 63,411.31/x
3. Step 3: Cross multiply
   139,306.89x = 208,986.59 × 63,411.31
4. Step 4: Simplify right side
   139,306.89x = 13,252,113,080.39
5. Step 5: Solve for x
   x = 13,252,113,080.39/139,306.89
6. Step 6: Final answer
   x = 95,128.91