Finding the Fourth Proportional to 85,884.72, 128,864.16 and 46,469.64

Step by Step Solution

1. Step 1: Write the proportion equation
   85,884.72 : 128,864.16 = 46,469.64 : x
2. Step 2: Convert to fraction form
   85,884.72/128,864.16 = 46,469.64/x
3. Step 3: Cross multiply
   85,884.72x = 128,864.16 × 46,469.64
4. Step 4: Simplify right side
   85,884.72x = 5,988,271,124.10
5. Step 5: Solve for x
   x = 5,988,271,124.10/85,884.72
6. Step 6: Final answer
   x = 69,724.52