Finding the Fourth Proportional to 124,789.36, 172,212.72 and 76,390.32

Step by Step Solution

1. Step 1: Write the proportion equation
   124,789.36 : 172,212.72 = 76,390.32 : x
2. Step 2: Convert to fraction form
   124,789.36/172,212.72 = 76,390.32/x
3. Step 3: Cross multiply
   124,789.36x = 172,212.72 × 76,390.32
4. Step 4: Simplify right side
   124,789.36x = 13,155,384,788.87
5. Step 5: Solve for x
   x = 13,155,384,788.87/124,789.36
6. Step 6: Final answer
   x = 105,420.72