Finding the Fourth Proportional to 72,085.23, 99,479.60 and 40,256.18

Step by Step Solution

1. Step 1: Write the proportion equation
   72,085.23 : 99,479.60 = 40,256.18 : x
2. Step 2: Convert to fraction form
   72,085.23/99,479.60 = 40,256.18/x
3. Step 3: Cross multiply
   72,085.23x = 99,479.60 × 40,256.18
4. Step 4: Simplify right side
   72,085.23x = 4,004,667,985.25
5. Step 5: Solve for x
   x = 4,004,667,985.25/72,085.23
6. Step 6: Final answer
   x = 55,554.63