Finding the Fourth Proportional to 82,972.91, 124,459.43 and 20,643.41

Step by Step Solution

1. Step 1: Write the proportion equation
   82,972.91 : 124,459.43 = 20,643.41 : x
2. Step 2: Convert to fraction form
   82,972.91/124,459.43 = 20,643.41/x
3. Step 3: Cross multiply
   82,972.91x = 124,459.43 × 20,643.41
4. Step 4: Simplify right side
   82,972.91x = 2,569,266,316.34
5. Step 5: Solve for x
   x = 2,569,266,316.34/82,972.91
6. Step 6: Final answer
   x = 30,965.12