Finding the Fourth Proportional to 82,139.86, 123,209.91 and 19,810.36

Step by Step Solution

1. Step 1: Write the proportion equation
   82,139.86 : 123,209.91 = 19,810.36 : x
2. Step 2: Convert to fraction form
   82,139.86/123,209.91 = 19,810.36/x
3. Step 3: Cross multiply
   82,139.86x = 123,209.91 × 19,810.36
4. Step 4: Simplify right side
   82,139.86x = 2,440,832,672.67
5. Step 5: Solve for x
   x = 2,440,832,672.67/82,139.86
6. Step 6: Final answer
   x = 29,715.57