Finding the Fourth Proportional to 139,097.39, 191,952.12 and 78,665.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,097.39 : 191,952.12 = 78,665.76 : x
2. Step 2: Convert to fraction form
   139,097.39/191,952.12 = 78,665.76/x
3. Step 3: Cross multiply
   139,097.39x = 191,952.12 × 78,665.76
4. Step 4: Simplify right side
   139,097.39x = 15,100,059,403.41
5. Step 5: Solve for x
   x = 15,100,059,403.41/139,097.39
6. Step 6: Final answer
   x = 108,557.46