Finding the Fourth Proportional to 76,181, 105,129.78 and 42,647.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,181 : 105,129.78 = 42,647.72 : x
2. Step 2: Convert to fraction form
   76,181/105,129.78 = 42,647.72/x
3. Step 3: Cross multiply
   76,181x = 105,129.78 × 42,647.72
4. Step 4: Simplify right side
   76,181x = 4,483,545,421.10
5. Step 5: Solve for x
   x = 4,483,545,421.10/76,181
6. Step 6: Final answer
   x = 58,853.85