Finding the Fourth Proportional to 111,315.20, 167,145.60 and 64,659.20

Step by Step Solution

1. Step 1: Write the proportion equation
   111,315.20 : 167,145.60 = 64,659.20 : x
2. Step 2: Convert to fraction form
   111,315.20/167,145.60 = 64,659.20/x
3. Step 3: Cross multiply
   111,315.20x = 167,145.60 × 64,659.20
4. Step 4: Simplify right side
   111,315.20x = 10,807,500,779.52
5. Step 5: Solve for x
   x = 10,807,500,779.52/111,315.20
6. Step 6: Final answer
   x = 97,089.17