Finding the Fourth Proportional to 76,128.69, 105,045.99 and 43,423.38

Step by Step Solution

1. Step 1: Write the proportion equation
   76,128.69 : 105,045.99 = 43,423.38 : x
2. Step 2: Convert to fraction form
   76,128.69/105,045.99 = 43,423.38/x
3. Step 3: Cross multiply
   76,128.69x = 105,045.99 × 43,423.38
4. Step 4: Simplify right side
   76,128.69x = 4,561,451,941.25
5. Step 5: Solve for x
   x = 4,561,451,941.25/76,128.69
6. Step 6: Final answer
   x = 59,917.65