Finding the Fourth Proportional to 139,220.32, 191,978.80 and 82,620.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,220.32 : 191,978.80 = 82,620.76 : x
2. Step 2: Convert to fraction form
   139,220.32/191,978.80 = 82,620.76/x
3. Step 3: Cross multiply
   139,220.32x = 191,978.80 × 82,620.76
4. Step 4: Simplify right side
   139,220.32x = 15,861,434,359.89
5. Step 5: Solve for x
   x = 15,861,434,359.89/139,220.32
6. Step 6: Final answer
   x = 113,930.45