Finding the Fourth Proportional to 105,262.94, 145,262.90 and 56,864.89

Step by Step Solution

1. Step 1: Write the proportion equation
   105,262.94 : 145,262.90 = 56,864.89 : x
2. Step 2: Convert to fraction form
   105,262.94/145,262.90 = 56,864.89/x
3. Step 3: Cross multiply
   105,262.94x = 145,262.90 × 56,864.89
4. Step 4: Simplify right side
   105,262.94x = 8,260,357,818.94
5. Step 5: Solve for x
   x = 8,260,357,818.94/105,262.94
6. Step 6: Final answer
   x = 78,473.56