Finding the Fourth Proportional to 85,900.72, 128,888.16 and 46,485.64

Step by Step Solution

1. Step 1: Write the proportion equation
   85,900.72 : 128,888.16 = 46,485.64 : x
2. Step 2: Convert to fraction form
   85,900.72/128,888.16 = 46,485.64/x
3. Step 3: Cross multiply
   85,900.72x = 128,888.16 × 46,485.64
4. Step 4: Simplify right side
   85,900.72x = 5,991,448,606.02
5. Step 5: Solve for x
   x = 5,991,448,606.02/85,900.72
6. Step 6: Final answer
   x = 69,748.53