Finding the Fourth Proportional to 111,528.42, 153,839.16 and 66,174.30

Step by Step Solution

1. Step 1: Write the proportion equation
   111,528.42 : 153,839.16 = 66,174.30 : x
2. Step 2: Convert to fraction form
   111,528.42/153,839.16 = 66,174.30/x
3. Step 3: Cross multiply
   111,528.42x = 153,839.16 × 66,174.30
4. Step 4: Simplify right side
   111,528.42x = 10,180,198,725.59
5. Step 5: Solve for x
   x = 10,180,198,725.59/111,528.42
6. Step 6: Final answer
   x = 91,278.96