Finding the Fourth Proportional to 139,114.91, 208,648.13 and 64,228.66

Step by Step Solution

1. Step 1: Write the proportion equation
   139,114.91 : 208,648.13 = 64,228.66 : x
2. Step 2: Convert to fraction form
   139,114.91/208,648.13 = 64,228.66/x
3. Step 3: Cross multiply
   139,114.91x = 208,648.13 × 64,228.66
4. Step 4: Simplify right side
   139,114.91x = 13,401,188,758.17
5. Step 5: Solve for x
   x = 13,401,188,758.17/139,114.91
6. Step 6: Final answer
   x = 96,331.79