Finding the Fourth Proportional to 80,422.72, 120,511.06 and 42,988.12

Step by Step Solution

1. Step 1: Write the proportion equation
   80,422.72 : 120,511.06 = 42,988.12 : x
2. Step 2: Convert to fraction form
   80,422.72/120,511.06 = 42,988.12/x
3. Step 3: Cross multiply
   80,422.72x = 120,511.06 × 42,988.12
4. Step 4: Simplify right side
   80,422.72x = 5,180,543,908.61
5. Step 5: Solve for x
   x = 5,180,543,908.61/80,422.72
6. Step 6: Final answer
   x = 64,416.42