Finding the Fourth Proportional to 83,145.69, 124,718.18 and 20,816.01

Step by Step Solution

1. Step 1: Write the proportion equation
   83,145.69 : 124,718.18 = 20,816.01 : x
2. Step 2: Convert to fraction form
   83,145.69/124,718.18 = 20,816.01/x
3. Step 3: Cross multiply
   83,145.69x = 124,718.18 × 20,816.01
4. Step 4: Simplify right side
   83,145.69x = 2,596,134,777.98
5. Step 5: Solve for x
   x = 2,596,134,777.98/83,145.69
6. Step 6: Final answer
   x = 31,223.92