Finding the Fourth Proportional to 76,406, 105,443.52 and 42,872

Step by Step Solution

1. Step 1: Write the proportion equation
   76,406 : 105,443.52 = 42,872 : x
2. Step 2: Convert to fraction form
   76,406/105,443.52 = 42,872/x
3. Step 3: Cross multiply
   76,406x = 105,443.52 × 42,872
4. Step 4: Simplify right side
   76,406x = 4,520,574,589.44
5. Step 5: Solve for x
   x = 4,520,574,589.44/76,406
6. Step 6: Final answer
   x = 59,165.18