Finding the Fourth Proportional to 85,846.35, 128,806.52 and 46,431.21

Step by Step Solution

1. Step 1: Write the proportion equation
   85,846.35 : 128,806.52 = 46,431.21 : x
2. Step 2: Convert to fraction form
   85,846.35/128,806.52 = 46,431.21/x
3. Step 3: Cross multiply
   85,846.35x = 128,806.52 × 46,431.21
4. Step 4: Simplify right side
   85,846.35x = 5,980,641,935.46
5. Step 5: Solve for x
   x = 5,980,641,935.46/85,846.35
6. Step 6: Final answer
   x = 69,666.82