Finding the Fourth Proportional to 139,801.89, 192,928.81 and 76,139.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,801.89 : 192,928.81 = 76,139.64 : x
2. Step 2: Convert to fraction form
   139,801.89/192,928.81 = 76,139.64/x
3. Step 3: Cross multiply
   139,801.89x = 192,928.81 × 76,139.64
4. Step 4: Simplify right side
   139,801.89x = 14,689,528,793.69
5. Step 5: Solve for x
   x = 14,689,528,793.69/139,801.89
6. Step 6: Final answer
   x = 105,073.89