Finding the Fourth Proportional to 105,490.74, 145,578.83 and 57,748.53

Step by Step Solution

1. Step 1: Write the proportion equation
   105,490.74 : 145,578.83 = 57,748.53 : x
2. Step 2: Convert to fraction form
   105,490.74/145,578.83 = 57,748.53/x
3. Step 3: Cross multiply
   105,490.74x = 145,578.83 × 57,748.53
4. Step 4: Simplify right side
   105,490.74x = 8,406,963,142.88
5. Step 5: Solve for x
   x = 8,406,963,142.88/105,490.74
6. Step 6: Final answer
   x = 79,693.85