Finding the Fourth Proportional to 80,870.17, 121,312.56 and 21,705.44

Step by Step Solution

1. Step 1: Write the proportion equation
   80,870.17 : 121,312.56 = 21,705.44 : x
2. Step 2: Convert to fraction form
   80,870.17/121,312.56 = 21,705.44/x
3. Step 3: Cross multiply
   80,870.17x = 121,312.56 × 21,705.44
4. Step 4: Simplify right side
   80,870.17x = 2,633,142,929.69
5. Step 5: Solve for x
   x = 2,633,142,929.69/80,870.17
6. Step 6: Final answer
   x = 32,560.13