Finding the Fourth Proportional to 83,109.77, 124,664.65 and 20,780.27

Step by Step Solution

1. Step 1: Write the proportion equation
   83,109.77 : 124,664.65 = 20,780.27 : x
2. Step 2: Convert to fraction form
   83,109.77/124,664.65 = 20,780.27/x
3. Step 3: Cross multiply
   83,109.77x = 124,664.65 × 20,780.27
4. Step 4: Simplify right side
   83,109.77x = 2,590,565,086.46
5. Step 5: Solve for x
   x = 2,590,565,086.46/83,109.77
6. Step 6: Final answer
   x = 31,170.40