Finding the Fourth Proportional to 111,688.81, 167,532.87 and 45,128.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111,688.81 : 167,532.87 = 45,128.15 : x
2. Step 2: Convert to fraction form
   111,688.81/167,532.87 = 45,128.15/x
3. Step 3: Cross multiply
   111,688.81x = 167,532.87 × 45,128.15
4. Step 4: Simplify right side
   111,688.81x = 7,560,448,487.29
5. Step 5: Solve for x
   x = 7,560,448,487.29/111,688.81
6. Step 6: Final answer
   x = 67,692.09