Finding the Fourth Proportional to 82,128.66, 123,192.90 and 19,799.16

Step by Step Solution

1. Step 1: Write the proportion equation
   82,128.66 : 123,192.90 = 19,799.16 : x
2. Step 2: Convert to fraction form
   82,128.66/123,192.90 = 19,799.16/x
3. Step 3: Cross multiply
   82,128.66x = 123,192.90 × 19,799.16
4. Step 4: Simplify right side
   82,128.66x = 2,439,115,937.96
5. Step 5: Solve for x
   x = 2,439,115,937.96/82,128.66
6. Step 6: Final answer
   x = 29,698.72