Finding the Fourth Proportional to 105,406.98, 145,462.86 and 57,659.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,406.98 : 145,462.86 = 57,659.30 : x
2. Step 2: Convert to fraction form
   105,406.98/145,462.86 = 57,659.30/x
3. Step 3: Cross multiply
   105,406.98x = 145,462.86 × 57,659.30
4. Step 4: Simplify right side
   105,406.98x = 8,387,286,683.60
5. Step 5: Solve for x
   x = 8,387,286,683.60/105,406.98
6. Step 6: Final answer
   x = 79,570.51