Finding the Fourth Proportional to 139,412.57, 208,838.18 and 64,429.45

Step by Step Solution

1. Step 1: Write the proportion equation
   139,412.57 : 208,838.18 = 64,429.45 : x
2. Step 2: Convert to fraction form
   139,412.57/208,838.18 = 64,429.45/x
3. Step 3: Cross multiply
   139,412.57x = 208,838.18 × 64,429.45
4. Step 4: Simplify right side
   139,412.57x = 13,455,328,715.38
5. Step 5: Solve for x
   x = 13,455,328,715.38/139,412.57
6. Step 6: Final answer
   x = 96,514.46