Finding the Fourth Proportional to 123,572.20, 185,315.10 and 64,388.20

Step by Step Solution

1. Step 1: Write the proportion equation
   123,572.20 : 185,315.10 = 64,388.20 : x
2. Step 2: Convert to fraction form
   123,572.20/185,315.10 = 64,388.20/x
3. Step 3: Cross multiply
   123,572.20x = 185,315.10 × 64,388.20
4. Step 4: Simplify right side
   123,572.20x = 11,932,105,721.82
5. Step 5: Solve for x
   x = 11,932,105,721.82/123,572.20
6. Step 6: Final answer
   x = 96,559.79