Finding the Fourth Proportional to 139,060.07, 191,901.73 and 78,642.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,060.07 : 191,901.73 = 78,642.57 : x
2. Step 2: Convert to fraction form
   139,060.07/191,901.73 = 78,642.57/x
3. Step 3: Cross multiply
   139,060.07x = 191,901.73 × 78,642.57
4. Step 4: Simplify right side
   139,060.07x = 15,091,645,234.65
5. Step 5: Solve for x
   x = 15,091,645,234.65/139,060.07
6. Step 6: Final answer
   x = 108,526.09