Finding the Fourth Proportional to 105,174.42, 145,146.58 and 57,432.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,174.42 : 145,146.58 = 57,432.20 : x
2. Step 2: Convert to fraction form
   105,174.42/145,146.58 = 57,432.20/x
3. Step 3: Cross multiply
   105,174.42x = 145,146.58 × 57,432.20
4. Step 4: Simplify right side
   105,174.42x = 8,336,087,411.88
5. Step 5: Solve for x
   x = 8,336,087,411.88/105,174.42
6. Step 6: Final answer
   x = 79,259.65