Finding the Fourth Proportional to 76,131.78, 105,059.23 and 42,141.75

Step by Step Solution

1. Step 1: Write the proportion equation
   76,131.78 : 105,059.23 = 42,141.75 : x
2. Step 2: Convert to fraction form
   76,131.78/105,059.23 = 42,141.75/x
3. Step 3: Cross multiply
   76,131.78x = 105,059.23 × 42,141.75
4. Step 4: Simplify right side
   76,131.78x = 4,427,379,595.14
5. Step 5: Solve for x
   x = 4,427,379,595.14/76,131.78
6. Step 6: Final answer
   x = 58,154.16