Finding the Fourth Proportional to 138,073.02, 207,499.55 and 81,923.69

Step by Step Solution

1. Step 1: Write the proportion equation
   138,073.02 : 207,499.55 = 81,923.69 : x
2. Step 2: Convert to fraction form
   138,073.02/207,499.55 = 81,923.69/x
3. Step 3: Cross multiply
   138,073.02x = 207,499.55 × 81,923.69
4. Step 4: Simplify right side
   138,073.02x = 16,999,127,362.22
5. Step 5: Solve for x
   x = 16,999,127,362.22/138,073.02
6. Step 6: Final answer
   x = 123,116.94