Finding the Fourth Proportional to 105,179.40, 145,146.84 and 57,432.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,179.40 : 145,146.84 = 57,432.72 : x
2. Step 2: Convert to fraction form
   105,179.40/145,146.84 = 57,432.72/x
3. Step 3: Cross multiply
   105,179.40x = 145,146.84 × 57,432.72
4. Step 4: Simplify right side
   105,179.40x = 8,336,177,820.60
5. Step 5: Solve for x
   x = 8,336,177,820.60/105,179.40
6. Step 6: Final answer
   x = 79,256.75