Finding the Fourth Proportional to 76,656.78, 114,970.59 and 20,499.48

Step by Step Solution

1. Step 1: Write the proportion equation
   76,656.78 : 114,970.59 = 20,499.48 : x
2. Step 2: Convert to fraction form
   76,656.78/114,970.59 = 20,499.48/x
3. Step 3: Cross multiply
   76,656.78x = 114,970.59 × 20,499.48
4. Step 4: Simplify right side
   76,656.78x = 2,356,837,310.29
5. Step 5: Solve for x
   x = 2,356,837,310.29/76,656.78
6. Step 6: Final answer
   x = 30,745.32