Finding the Fourth Proportional to 105,644.78, 145,788.95 and 57,898.01

Step by Step Solution

1. Step 1: Write the proportion equation
   105,644.78 : 145,788.95 = 57,898.01 : x
2. Step 2: Convert to fraction form
   105,644.78/145,788.95 = 57,898.01/x
3. Step 3: Cross multiply
   105,644.78x = 145,788.95 × 57,898.01
4. Step 4: Simplify right side
   105,644.78x = 8,440,890,047.50
5. Step 5: Solve for x
   x = 8,440,890,047.50/105,644.78
6. Step 6: Final answer
   x = 79,898.79