Finding the Fourth Proportional to 80,856.84, 121,307.15 and 45,821.10

Step by Step Solution

1. Step 1: Write the proportion equation
   80,856.84 : 121,307.15 = 45,821.10 : x
2. Step 2: Convert to fraction form
   80,856.84/121,307.15 = 45,821.10/x
3. Step 3: Cross multiply
   80,856.84x = 121,307.15 × 45,821.10
4. Step 4: Simplify right side
   80,856.84x = 5,558,427,050.87
5. Step 5: Solve for x
   x = 5,558,427,050.87/80,856.84
6. Step 6: Final answer
   x = 68,744.05