Finding the Fourth Proportional to 139,209.50, 192,109.25 and 75,547.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139,209.50 : 192,109.25 = 75,547.31 : x
2. Step 2: Convert to fraction form
   139,209.50/192,109.25 = 75,547.31/x
3. Step 3: Cross multiply
   139,209.50x = 192,109.25 × 75,547.31
4. Step 4: Simplify right side
   139,209.50x = 14,513,337,063.62
5. Step 5: Solve for x
   x = 14,513,337,063.62/139,209.50
6. Step 6: Final answer
   x = 104,255.36