Finding the Fourth Proportional to 109,643.20, 151,310.56 and 66,608.05

Step by Step Solution

1. Step 1: Write the proportion equation
   109,643.20 : 151,310.56 = 66,608.05 : x
2. Step 2: Convert to fraction form
   109,643.20/151,310.56 = 66,608.05/x
3. Step 3: Cross multiply
   109,643.20x = 151,310.56 × 66,608.05
4. Step 4: Simplify right side
   109,643.20x = 10,078,500,422.94
5. Step 5: Solve for x
   x = 10,078,500,422.94/109,643.20
6. Step 6: Final answer
   x = 91,920.89