Finding the Fourth Proportional to 123,781.21, 170,820.79 and 75,385.42

Step by Step Solution

1. Step 1: Write the proportion equation
   123,781.21 : 170,820.79 = 75,385.42 : x
2. Step 2: Convert to fraction form
   123,781.21/170,820.79 = 75,385.42/x
3. Step 3: Cross multiply
   123,781.21x = 170,820.79 × 75,385.42
4. Step 4: Simplify right side
   123,781.21x = 12,877,396,383.37
5. Step 5: Solve for x
   x = 12,877,396,383.37/123,781.21
6. Step 6: Final answer
   x = 104,033.53