Finding the Fourth Proportional to 83,111.96, 124,665.96 and 20,782.40

Step by Step Solution

1. Step 1: Write the proportion equation
   83,111.96 : 124,665.96 = 20,782.40 : x
2. Step 2: Convert to fraction form
   83,111.96/124,665.96 = 20,782.40/x
3. Step 3: Cross multiply
   83,111.96x = 124,665.96 × 20,782.40
4. Step 4: Simplify right side
   83,111.96x = 2,590,857,847.10
5. Step 5: Solve for x
   x = 2,590,857,847.10/83,111.96
6. Step 6: Final answer
   x = 31,173.10