Finding the Fourth Proportional to 80,422.49, 120,510.69 and 42,987.87

Step by Step Solution

1. Step 1: Write the proportion equation
   80,422.49 : 120,510.69 = 42,987.87 : x
2. Step 2: Convert to fraction form
   80,422.49/120,510.69 = 42,987.87/x
3. Step 3: Cross multiply
   80,422.49x = 120,510.69 × 42,987.87
4. Step 4: Simplify right side
   80,422.49x = 5,180,497,875.33
5. Step 5: Solve for x
   x = 5,180,497,875.33/80,422.49
6. Step 6: Final answer
   x = 64,416.04