Finding the Fourth Proportional to 139,802.14, 192,929.15 and 76,139.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139,802.14 : 192,929.15 = 76,139.89 : x
2. Step 2: Convert to fraction form
   139,802.14/192,929.15 = 76,139.89/x
3. Step 3: Cross multiply
   139,802.14x = 192,929.15 × 76,139.89
4. Step 4: Simplify right side
   139,802.14x = 14,689,603,966.82
5. Step 5: Solve for x
   x = 14,689,603,966.82/139,802.14
6. Step 6: Final answer
   x = 105,074.24