Finding the Fourth Proportional to 76,400.94, 105,428.31 and 42,407.82

Step by Step Solution

1. Step 1: Write the proportion equation
   76,400.94 : 105,428.31 = 42,407.82 : x
2. Step 2: Convert to fraction form
   76,400.94/105,428.31 = 42,407.82/x
3. Step 3: Cross multiply
   76,400.94x = 105,428.31 × 42,407.82
4. Step 4: Simplify right side
   76,400.94x = 4,470,984,793.38
5. Step 5: Solve for x
   x = 4,470,984,793.38/76,400.94
6. Step 6: Final answer
   x = 58,520.02