Finding the Fourth Proportional to 105,631.38, 145,774.86 and 57,884.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,631.38 : 145,774.86 = 57,884.31 : x
2. Step 2: Convert to fraction form
   105,631.38/145,774.86 = 57,884.31/x
3. Step 3: Cross multiply
   105,631.38x = 145,774.86 × 57,884.31
4. Step 4: Simplify right side
   105,631.38x = 8,438,076,897.03
5. Step 5: Solve for x
   x = 8,438,076,897.03/105,631.38
6. Step 6: Final answer
   x = 79,882.29