Finding the Fourth Proportional to 105,490.42, 145,576.98 and 57,746.82

Step by Step Solution

1. Step 1: Write the proportion equation
   105,490.42 : 145,576.98 = 57,746.82 : x
2. Step 2: Convert to fraction form
   105,490.42/145,576.98 = 57,746.82/x
3. Step 3: Cross multiply
   105,490.42x = 145,576.98 × 57,746.82
4. Step 4: Simplify right side
   105,490.42x = 8,406,607,660.20
5. Step 5: Solve for x
   x = 8,406,607,660.20/105,490.42
6. Step 6: Final answer
   x = 79,690.72