Finding the Fourth Proportional to 72,171.76, 99,598.82 and 40,345.96

Step by Step Solution

1. Step 1: Write the proportion equation
   72,171.76 : 99,598.82 = 40,345.96 : x
2. Step 2: Convert to fraction form
   72,171.76/99,598.82 = 40,345.96/x
3. Step 3: Cross multiply
   72,171.76x = 99,598.82 × 40,345.96
4. Step 4: Simplify right side
   72,171.76x = 4,018,410,007.77
5. Step 5: Solve for x
   x = 4,018,410,007.77/72,171.76
6. Step 6: Final answer
   x = 55,678.43