Finding the Fourth Proportional to 108,980.94, 163,145.52 and 66,728.10

Step by Step Solution

1. Step 1: Write the proportion equation
   108,980.94 : 163,145.52 = 66,728.10 : x
2. Step 2: Convert to fraction form
   108,980.94/163,145.52 = 66,728.10/x
3. Step 3: Cross multiply
   108,980.94x = 163,145.52 × 66,728.10
4. Step 4: Simplify right side
   108,980.94x = 10,886,390,573.11
5. Step 5: Solve for x
   x = 10,886,390,573.11/108,980.94
6. Step 6: Final answer
   x = 99,892.61