Finding the Fourth Proportional to 139,156.96, 208,564.36 and 64,173

Step by Step Solution

1. Step 1: Write the proportion equation
   139,156.96 : 208,564.36 = 64,173 : x
2. Step 2: Convert to fraction form
   139,156.96/208,564.36 = 64,173/x
3. Step 3: Cross multiply
   139,156.96x = 208,564.36 × 64,173
4. Step 4: Simplify right side
   139,156.96x = 13,384,200,674.28
5. Step 5: Solve for x
   x = 13,384,200,674.28/139,156.96
6. Step 6: Final answer
   x = 96,180.61