Finding the Fourth Proportional to 216,429.30, 324,490.35 and 83,258.10

Step by Step Solution

1. Step 1: Write the proportion equation
   216,429.30 : 324,490.35 = 83,258.10 : x
2. Step 2: Convert to fraction form
   216,429.30/324,490.35 = 83,258.10/x
3. Step 3: Cross multiply
   216,429.30x = 324,490.35 × 83,258.10
4. Step 4: Simplify right side
   216,429.30x = 27,016,450,009.34
5. Step 5: Solve for x
   x = 27,016,450,009.34/216,429.30
6. Step 6: Final answer
   x = 124,828.06