Finding the Fourth Proportional to 139,156.46, 208,563.62 and 64,172.51

Step by Step Solution

1. Step 1: Write the proportion equation
   139,156.46 : 208,563.62 = 64,172.51 : x
2. Step 2: Convert to fraction form
   139,156.46/208,563.62 = 64,172.51/x
3. Step 3: Cross multiply
   139,156.46x = 208,563.62 × 64,172.51
4. Step 4: Simplify right side
   139,156.46x = 13,384,049,626.41
5. Step 5: Solve for x
   x = 13,384,049,626.41/139,156.46
6. Step 6: Final answer
   x = 96,179.87