Finding the Fourth Proportional to 72,185.13, 99,618.57 and 40,354.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72,185.13 : 99,618.57 = 40,354.02 : x
2. Step 2: Convert to fraction form
   72,185.13/99,618.57 = 40,354.02/x
3. Step 3: Cross multiply
   72,185.13x = 99,618.57 × 40,354.02
4. Step 4: Simplify right side
   72,185.13x = 4,020,009,766.15
5. Step 5: Solve for x
   x = 4,020,009,766.15/72,185.13
6. Step 6: Final answer
   x = 55,690.28