Finding the Fourth Proportional to 139,061.28, 191,896.92 and 78,628.44

Step by Step Solution

1. Step 1: Write the proportion equation
   139,061.28 : 191,896.92 = 78,628.44 : x
2. Step 2: Convert to fraction form
   139,061.28/191,896.92 = 78,628.44/x
3. Step 3: Cross multiply
   139,061.28x = 191,896.92 × 78,628.44
4. Step 4: Simplify right side
   139,061.28x = 15,088,555,460.40
5. Step 5: Solve for x
   x = 15,088,555,460.40/139,061.28
6. Step 6: Final answer
   x = 108,502.92