Finding the Fourth Proportional to 82,645.68, 123,970.86 and 20,316

Step by Step Solution

1. Step 1: Write the proportion equation
   82,645.68 : 123,970.86 = 20,316 : x
2. Step 2: Convert to fraction form
   82,645.68/123,970.86 = 20,316/x
3. Step 3: Cross multiply
   82,645.68x = 123,970.86 × 20,316
4. Step 4: Simplify right side
   82,645.68x = 2,518,591,991.76
5. Step 5: Solve for x
   x = 2,518,591,991.76/82,645.68
6. Step 6: Final answer
   x = 30,474.58