Finding the Fourth Proportional to 105,144.84, 145,094.34 and 57,388.92

Step by Step Solution

1. Step 1: Write the proportion equation
   105,144.84 : 145,094.34 = 57,388.92 : x
2. Step 2: Convert to fraction form
   105,144.84/145,094.34 = 57,388.92/x
3. Step 3: Cross multiply
   105,144.84x = 145,094.34 × 57,388.92
4. Step 4: Simplify right side
   105,144.84x = 8,326,807,470.71
5. Step 5: Solve for x
   x = 8,326,807,470.71/105,144.84
6. Step 6: Final answer
   x = 79,193.69