Finding the Fourth Proportional to 85,929.72, 128,945.61 and 46,485.96

Step by Step Solution

1. Step 1: Write the proportion equation
   85,929.72 : 128,945.61 = 46,485.96 : x
2. Step 2: Convert to fraction form
   85,929.72/128,945.61 = 46,485.96/x
3. Step 3: Cross multiply
   85,929.72x = 128,945.61 × 46,485.96
4. Step 4: Simplify right side
   85,929.72x = 5,994,160,468.64
5. Step 5: Solve for x
   x = 5,994,160,468.64/85,929.72
6. Step 6: Final answer
   x = 69,756.55