Finding the Fourth Proportional to 92,918.69, 128,216.90 and 54,669.83

Step by Step Solution

1. Step 1: Write the proportion equation
   92,918.69 : 128,216.90 = 54,669.83 : x
2. Step 2: Convert to fraction form
   92,918.69/128,216.90 = 54,669.83/x
3. Step 3: Cross multiply
   92,918.69x = 128,216.90 × 54,669.83
4. Step 4: Simplify right side
   92,918.69x = 7,009,595,621.72
5. Step 5: Solve for x
   x = 7,009,595,621.72/92,918.69
6. Step 6: Final answer
   x = 75,437.96