Finding the Fourth Proportional to 111,772.15, 154,191.32 and 66,418.03

Step by Step Solution

1. Step 1: Write the proportion equation
   111,772.15 : 154,191.32 = 66,418.03 : x
2. Step 2: Convert to fraction form
   111,772.15/154,191.32 = 66,418.03/x
3. Step 3: Cross multiply
   111,772.15x = 154,191.32 × 66,418.03
4. Step 4: Simplify right side
   111,772.15x = 10,241,083,146.69
5. Step 5: Solve for x
   x = 10,241,083,146.69/111,772.15
6. Step 6: Final answer
   x = 91,624.64