Finding the Fourth Proportional to 70,981.83, 106,472.22 and 21,057.78

Step by Step Solution

1. Step 1: Write the proportion equation
   70,981.83 : 106,472.22 = 21,057.78 : x
2. Step 2: Convert to fraction form
   70,981.83/106,472.22 = 21,057.78/x
3. Step 3: Cross multiply
   70,981.83x = 106,472.22 × 21,057.78
4. Step 4: Simplify right side
   70,981.83x = 2,242,068,584.87
5. Step 5: Solve for x
   x = 2,242,068,584.87/70,981.83
6. Step 6: Final answer
   x = 31,586.51