Finding the Fourth Proportional to 57,705.58, 86,623.98 and 53,900.20

Step by Step Solution

1. Step 1: Write the proportion equation
   57,705.58 : 86,623.98 = 53,900.20 : x
2. Step 2: Convert to fraction form
   57,705.58/86,623.98 = 53,900.20/x
3. Step 3: Cross multiply
   57,705.58x = 86,623.98 × 53,900.20
4. Step 4: Simplify right side
   57,705.58x = 4,669,049,846.80
5. Step 5: Solve for x
   x = 4,669,049,846.80/57,705.58
6. Step 6: Final answer
   x = 80,911.58