Finding the Fourth Proportional to 72,088.20, 99,481.86 and 40,257

Step by Step Solution

1. Step 1: Write the proportion equation
   72,088.20 : 99,481.86 = 40,257 : x
2. Step 2: Convert to fraction form
   72,088.20/99,481.86 = 40,257/x
3. Step 3: Cross multiply
   72,088.20x = 99,481.86 × 40,257
4. Step 4: Simplify right side
   72,088.20x = 4,004,841,238.02
5. Step 5: Solve for x
   x = 4,004,841,238.02/72,088.20
6. Step 6: Final answer
   x = 55,554.74