Finding the Fourth Proportional to 111,570.86, 153,916.25 and 66,223.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111,570.86 : 153,916.25 = 66,223.10 : x
2. Step 2: Convert to fraction form
   111,570.86/153,916.25 = 66,223.10/x
3. Step 3: Cross multiply
   111,570.86x = 153,916.25 × 66,223.10
4. Step 4: Simplify right side
   111,570.86x = 10,192,810,114.68
5. Step 5: Solve for x
   x = 10,192,810,114.68/111,570.86
6. Step 6: Final answer
   x = 91,357.28