Finding the Fourth Proportional to 83,111.68, 124,667.76 and 20,782.16

Step by Step Solution

1. Step 1: Write the proportion equation
   83,111.68 : 124,667.76 = 20,782.16 : x
2. Step 2: Convert to fraction form
   83,111.68/124,667.76 = 20,782.16/x
3. Step 3: Cross multiply
   83,111.68x = 124,667.76 × 20,782.16
4. Step 4: Simplify right side
   83,111.68x = 2,590,865,335.16
5. Step 5: Solve for x
   x = 2,590,865,335.16/83,111.68
6. Step 6: Final answer
   x = 31,173.30