Finding the Fourth Proportional to 72,402.46, 99,921 and 40,574.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72,402.46 : 99,921 = 40,574.32 : x
2. Step 2: Convert to fraction form
   72,402.46/99,921 = 40,574.32/x
3. Step 3: Cross multiply
   72,402.46x = 99,921 × 40,574.32
4. Step 4: Simplify right side
   72,402.46x = 4,054,226,628.72
5. Step 5: Solve for x
   x = 4,054,226,628.72/72,402.46
6. Step 6: Final answer
   x = 55,995.70