Finding the Fourth Proportional to 105,114.60, 145,178.82 and 76,561.47

Step by Step Solution

1. Step 1: Write the proportion equation
   105,114.60 : 145,178.82 = 76,561.47 : x
2. Step 2: Convert to fraction form
   105,114.60/145,178.82 = 76,561.47/x
3. Step 3: Cross multiply
   105,114.60x = 145,178.82 × 76,561.47
4. Step 4: Simplify right side
   105,114.60x = 11,115,103,872.07
5. Step 5: Solve for x
   x = 11,115,103,872.07/105,114.60
6. Step 6: Final answer
   x = 105,742.72