Finding the Fourth Proportional to 72,172.29, 99,595.09 and 40,341.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,172.29 : 99,595.09 = 40,341.72 : x
2. Step 2: Convert to fraction form
   72,172.29/99,595.09 = 40,341.72/x
3. Step 3: Cross multiply
   72,172.29x = 99,595.09 × 40,341.72
4. Step 4: Simplify right side
   72,172.29x = 4,017,837,032.45
5. Step 5: Solve for x
   x = 4,017,837,032.45/72,172.29
6. Step 6: Final answer
   x = 55,670.08