Finding the Fourth Proportional to 139,042.07, 191,870.37 and 78,608.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,042.07 : 191,870.37 = 78,608.88 : x
2. Step 2: Convert to fraction form
   139,042.07/191,870.37 = 78,608.88/x
3. Step 3: Cross multiply
   139,042.07x = 191,870.37 × 78,608.88
4. Step 4: Simplify right side
   139,042.07x = 15,082,714,890.89
5. Step 5: Solve for x
   x = 15,082,714,890.89/139,042.07
6. Step 6: Final answer
   x = 108,475.91