Finding the Fourth Proportional to 139,802.72, 192,928.74 and 76,139.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,802.72 : 192,928.74 = 76,139.24 : x
2. Step 2: Convert to fraction form
   139,802.72/192,928.74 = 76,139.24/x
3. Step 3: Cross multiply
   139,802.72x = 192,928.74 × 76,139.24
4. Step 4: Simplify right side
   139,802.72x = 14,689,447,637.76
5. Step 5: Solve for x
   x = 14,689,447,637.76/139,802.72
6. Step 6: Final answer
   x = 105,072.69