Finding the Fourth Proportional to 72,078.78, 99,564.75 and 57,984.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,078.78 : 99,564.75 = 57,984.78 : x
2. Step 2: Convert to fraction form
   72,078.78/99,564.75 = 57,984.78/x
3. Step 3: Cross multiply
   72,078.78x = 99,564.75 × 57,984.78
4. Step 4: Simplify right side
   72,078.78x = 5,773,240,124.51
5. Step 5: Solve for x
   x = 5,773,240,124.51/72,078.78
6. Step 6: Final answer
   x = 80,096.25