Finding the Fourth Proportional to 76,215.57, 105,177.57 and 42,681.57

Step by Step Solution

1. Step 1: Write the proportion equation
   76,215.57 : 105,177.57 = 42,681.57 : x
2. Step 2: Convert to fraction form
   76,215.57/105,177.57 = 42,681.57/x
3. Step 3: Cross multiply
   76,215.57x = 105,177.57 × 42,681.57
4. Step 4: Simplify right side
   76,215.57x = 4,489,143,816.38
5. Step 5: Solve for x
   x = 4,489,143,816.38/76,215.57
6. Step 6: Final answer
   x = 58,900.61