Finding the Fourth Proportional to 111,479, 153,790.78 and 66,158.90

Step by Step Solution

1. Step 1: Write the proportion equation
   111,479 : 153,790.78 = 66,158.90 : x
2. Step 2: Convert to fraction form
   111,479/153,790.78 = 66,158.90/x
3. Step 3: Cross multiply
   111,479x = 153,790.78 × 66,158.90
4. Step 4: Simplify right side
   111,479x = 10,174,628,834.94
5. Step 5: Solve for x
   x = 10,174,628,834.94/111,479
6. Step 6: Final answer
   x = 91,269.47