Finding the Fourth Proportional to 57,972.72, 86,921.64 and 18,516.72

Step by Step Solution

1. Step 1: Write the proportion equation
   57,972.72 : 86,921.64 = 18,516.72 : x
2. Step 2: Convert to fraction form
   57,972.72/86,921.64 = 18,516.72/x
3. Step 3: Cross multiply
   57,972.72x = 86,921.64 × 18,516.72
4. Step 4: Simplify right side
   57,972.72x = 1,609,503,669.82
5. Step 5: Solve for x
   x = 1,609,503,669.82/57,972.72
6. Step 6: Final answer
   x = 27,763.12