Finding the Fourth Proportional to 139,412, 192,389.46 and 75,749.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,412 : 192,389.46 = 75,749.78 : x
2. Step 2: Convert to fraction form
   139,412/192,389.46 = 75,749.78/x
3. Step 3: Cross multiply
   139,412x = 192,389.46 × 75,749.78
4. Step 4: Simplify right side
   139,412x = 14,573,459,269.32
5. Step 5: Solve for x
   x = 14,573,459,269.32/139,412
6. Step 6: Final answer
   x = 104,535.19