Finding the Fourth Proportional to 123,288.20, 185,018.70 and 53,217.80

Step by Step Solution

1. Step 1: Write the proportion equation
   123,288.20 : 185,018.70 = 53,217.80 : x
2. Step 2: Convert to fraction form
   123,288.20/185,018.70 = 53,217.80/x
3. Step 3: Cross multiply
   123,288.20x = 185,018.70 × 53,217.80
4. Step 4: Simplify right side
   123,288.20x = 9,846,288,172.86
5. Step 5: Solve for x
   x = 9,846,288,172.86/123,288.20
6. Step 6: Final answer
   x = 79,863.99