Finding the Fourth Proportional to 70,749.72, 106,123.05 and 20,828.58

Step by Step Solution

1. Step 1: Write the proportion equation
   70,749.72 : 106,123.05 = 20,828.58 : x
2. Step 2: Convert to fraction form
   70,749.72/106,123.05 = 20,828.58/x
3. Step 3: Cross multiply
   70,749.72x = 106,123.05 × 20,828.58
4. Step 4: Simplify right side
   70,749.72x = 2,210,392,436.77
5. Step 5: Solve for x
   x = 2,210,392,436.77/70,749.72
6. Step 6: Final answer
   x = 31,242.42