Finding the Fourth Proportional to 128,961.31, 193,379.77 and 54,061.36

Step by Step Solution

1. Step 1: Write the proportion equation
   128,961.31 : 193,379.77 = 54,061.36 : x
2. Step 2: Convert to fraction form
   128,961.31/193,379.77 = 54,061.36/x
3. Step 3: Cross multiply
   128,961.31x = 193,379.77 × 54,061.36
4. Step 4: Simplify right side
   128,961.31x = 10,454,373,362.69
5. Step 5: Solve for x
   x = 10,454,373,362.69/128,961.31
6. Step 6: Final answer
   x = 81,065.97