Finding the Fourth Proportional to 139,047.46, 191,895.32 and 78,618.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139,047.46 : 191,895.32 = 78,618.69 : x
2. Step 2: Convert to fraction form
   139,047.46/191,895.32 = 78,618.69/x
3. Step 3: Cross multiply
   139,047.46x = 191,895.32 × 78,618.69
4. Step 4: Simplify right side
   139,047.46x = 15,086,558,872.08
5. Step 5: Solve for x
   x = 15,086,558,872.08/139,047.46
6. Step 6: Final answer
   x = 108,499.35