Finding the Fourth Proportional to 139,649.72, 192,715.72 and 75,987.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,649.72 : 192,715.72 = 75,987.76 : x
2. Step 2: Convert to fraction form
   139,649.72/192,715.72 = 75,987.76/x
3. Step 3: Cross multiply
   139,649.72x = 192,715.72 × 75,987.76
4. Step 4: Simplify right side
   139,649.72x = 14,644,035,879.59
5. Step 5: Solve for x
   x = 14,644,035,879.59/139,649.72
6. Step 6: Final answer
   x = 104,862.62