Finding the Fourth Proportional to 139,498.34, 209,240.01 and 81,827.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139,498.34 : 209,240.01 = 81,827.69 : x
2. Step 2: Convert to fraction form
   139,498.34/209,240.01 = 81,827.69/x
3. Step 3: Cross multiply
   139,498.34x = 209,240.01 × 81,827.69
4. Step 4: Simplify right side
   139,498.34x = 17,121,625,627.68
5. Step 5: Solve for x
   x = 17,121,625,627.68/139,498.34
6. Step 6: Final answer
   x = 122,737.13