Finding the Fourth Proportional to 105,111.60, 145,048.68 and 57,364.56

Step by Step Solution

1. Step 1: Write the proportion equation
   105,111.60 : 145,048.68 = 57,364.56 : x
2. Step 2: Convert to fraction form
   105,111.60/145,048.68 = 57,364.56/x
3. Step 3: Cross multiply
   105,111.60x = 145,048.68 × 57,364.56
4. Step 4: Simplify right side
   105,111.60x = 8,320,653,706.78
5. Step 5: Solve for x
   x = 8,320,653,706.78/105,111.60
6. Step 6: Final answer
   x = 79,160.19