Finding the Fourth Proportional to 123,633.63, 170,541.32 and 78,921.63

Step by Step Solution

1. Step 1: Write the proportion equation
   123,633.63 : 170,541.32 = 78,921.63 : x
2. Step 2: Convert to fraction form
   123,633.63/170,541.32 = 78,921.63/x
3. Step 3: Cross multiply
   123,633.63x = 170,541.32 × 78,921.63
4. Step 4: Simplify right side
   123,633.63x = 13,459,398,562.14
5. Step 5: Solve for x
   x = 13,459,398,562.14/123,633.63
6. Step 6: Final answer
   x = 108,865.19