Finding the Fourth Proportional to 428,993.96, 643,494.58 and 109,146.15

Step by Step Solution

1. Step 1: Write the proportion equation
   428,993.96 : 643,494.58 = 109,146.15 : x
2. Step 2: Convert to fraction form
   428,993.96/643,494.58 = 109,146.15/x
3. Step 3: Cross multiply
   428,993.96x = 643,494.58 × 109,146.15
4. Step 4: Simplify right side
   428,993.96x = 70,234,955,680.00
5. Step 5: Solve for x
   x = 70,234,955,680.00/428,993.96
6. Step 6: Final answer
   x = 163,720.15