Finding the Fourth Proportional to 111,967.98, 154,446.39 and 66,615.30

Step by Step Solution

1. Step 1: Write the proportion equation
   111,967.98 : 154,446.39 = 66,615.30 : x
2. Step 2: Convert to fraction form
   111,967.98/154,446.39 = 66,615.30/x
3. Step 3: Cross multiply
   111,967.98x = 154,446.39 × 66,615.30
4. Step 4: Simplify right side
   111,967.98x = 10,288,492,603.77
5. Step 5: Solve for x
   x = 10,288,492,603.77/111,967.98
6. Step 6: Final answer
   x = 91,887.81