Finding the Fourth Proportional to 81,555.54, 122,355.18 and 64,978.08

Step by Step Solution

1. Step 1: Write the proportion equation
   81,555.54 : 122,355.18 = 64,978.08 : x
2. Step 2: Convert to fraction form
   81,555.54/122,355.18 = 64,978.08/x
3. Step 3: Cross multiply
   81,555.54x = 122,355.18 × 64,978.08
4. Step 4: Simplify right side
   81,555.54x = 7,950,404,674.45
5. Step 5: Solve for x
   x = 7,950,404,674.45/81,555.54
6. Step 6: Final answer
   x = 97,484.54