Finding the Fourth Proportional to 80,484.71, 120,729.34 and 21,320.39

Step by Step Solution

1. Step 1: Write the proportion equation
   80,484.71 : 120,729.34 = 21,320.39 : x
2. Step 2: Convert to fraction form
   80,484.71/120,729.34 = 21,320.39/x
3. Step 3: Cross multiply
   80,484.71x = 120,729.34 × 21,320.39
4. Step 4: Simplify right side
   80,484.71x = 2,573,996,009.60
5. Step 5: Solve for x
   x = 2,573,996,009.60/80,484.71
6. Step 6: Final answer
   x = 31,981.18