Finding the Fourth Proportional to 76,118.69, 105,041.18 and 42,128.60

Step by Step Solution

1. Step 1: Write the proportion equation
   76,118.69 : 105,041.18 = 42,128.60 : x
2. Step 2: Convert to fraction form
   76,118.69/105,041.18 = 42,128.60/x
3. Step 3: Cross multiply
   76,118.69x = 105,041.18 × 42,128.60
4. Step 4: Simplify right side
   76,118.69x = 4,425,237,435.86
5. Step 5: Solve for x
   x = 4,425,237,435.86/76,118.69
6. Step 6: Final answer
   x = 58,136.01