Finding the Fourth Proportional to 56,728.50, 85,082.72 and 21,181.84

Step by Step Solution

1. Step 1: Write the proportion equation
   56,728.50 : 85,082.72 = 21,181.84 : x
2. Step 2: Convert to fraction form
   56,728.50/85,082.72 = 21,181.84/x
3. Step 3: Cross multiply
   56,728.50x = 85,082.72 × 21,181.84
4. Step 4: Simplify right side
   56,728.50x = 1,802,208,561.80
5. Step 5: Solve for x
   x = 1,802,208,561.80/56,728.50
6. Step 6: Final answer
   x = 31,769.01