Finding the Fourth Proportional to 78,160.72, 117,240.76 and 18,996.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78,160.72 : 117,240.76 = 18,996.56 : x
2. Step 2: Convert to fraction form
   78,160.72/117,240.76 = 18,996.56/x
3. Step 3: Cross multiply
   78,160.72x = 117,240.76 × 18,996.56
4. Step 4: Simplify right side
   78,160.72x = 2,227,171,131.79
5. Step 5: Solve for x
   x = 2,227,171,131.79/78,160.72
6. Step 6: Final answer
   x = 28,494.76