Finding the Fourth Proportional to 76,128.39, 105,054.49 and 42,136.94

Step by Step Solution

1. Step 1: Write the proportion equation
   76,128.39 : 105,054.49 = 42,136.94 : x
2. Step 2: Convert to fraction form
   76,128.39/105,054.49 = 42,136.94/x
3. Step 3: Cross multiply
   76,128.39x = 105,054.49 × 42,136.94
4. Step 4: Simplify right side
   76,128.39x = 4,426,674,663.21
5. Step 5: Solve for x
   x = 4,426,674,663.21/76,128.39
6. Step 6: Final answer
   x = 58,147.49