Finding the Fourth Proportional to 139,314.56, 208,937.28 and 65,425.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,314.56 : 208,937.28 = 65,425.28 : x
2. Step 2: Convert to fraction form
   139,314.56/208,937.28 = 65,425.28/x
3. Step 3: Cross multiply
   139,314.56x = 208,937.28 × 65,425.28
4. Step 4: Simplify right side
   139,314.56x = 13,669,780,046.44
5. Step 5: Solve for x
   x = 13,669,780,046.44/139,314.56
6. Step 6: Final answer
   x = 98,121.69