Finding the Fourth Proportional to 260,139.48, 390,168.52 and 82,623.12

Step by Step Solution

1. Step 1: Write the proportion equation
   260,139.48 : 390,168.52 = 82,623.12 : x
2. Step 2: Convert to fraction form
   260,139.48/390,168.52 = 82,623.12/x
3. Step 3: Cross multiply
   260,139.48x = 390,168.52 × 82,623.12
4. Step 4: Simplify right side
   260,139.48x = 32,236,940,448.18
5. Step 5: Solve for x
   x = 32,236,940,448.18/260,139.48
6. Step 6: Final answer
   x = 123,921.75