Finding the Fourth Proportional to 139,053.58, 191,892.76 and 78,636.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,053.58 : 191,892.76 = 78,636.08 : x
2. Step 2: Convert to fraction form
   139,053.58/191,892.76 = 78,636.08/x
3. Step 3: Cross multiply
   139,053.58x = 191,892.76 × 78,636.08
4. Step 4: Simplify right side
   139,053.58x = 15,089,694,709.92
5. Step 5: Solve for x
   x = 15,089,694,709.92/139,053.58
6. Step 6: Final answer
   x = 108,517.13