Finding the Fourth Proportional to 139,443.06, 192,431.34 and 75,780.86

Step by Step Solution

1. Step 1: Write the proportion equation
   139,443.06 : 192,431.34 = 75,780.86 : x
2. Step 2: Convert to fraction form
   139,443.06/192,431.34 = 75,780.86/x
3. Step 3: Cross multiply
   139,443.06x = 192,431.34 × 75,780.86
4. Step 4: Simplify right side
   139,443.06x = 14,582,612,917.23
5. Step 5: Solve for x
   x = 14,582,612,917.23/139,443.06
6. Step 6: Final answer
   x = 104,577.55