Finding the Fourth Proportional to 139,071.96, 191,923.16 and 78,651.68

Step by Step Solution

1. Step 1: Write the proportion equation
   139,071.96 : 191,923.16 = 78,651.68 : x
2. Step 2: Convert to fraction form
   139,071.96/191,923.16 = 78,651.68/x
3. Step 3: Cross multiply
   139,071.96x = 191,923.16 × 78,651.68
4. Step 4: Simplify right side
   139,071.96x = 15,095,078,964.91
5. Step 5: Solve for x
   x = 15,095,078,964.91/139,071.96
6. Step 6: Final answer
   x = 108,541.50