Finding the Fourth Proportional to 105,575.18, 145,638.52 and 65,276.06

Step by Step Solution

1. Step 1: Write the proportion equation
   105,575.18 : 145,638.52 = 65,276.06 : x
2. Step 2: Convert to fraction form
   105,575.18/145,638.52 = 65,276.06/x
3. Step 3: Cross multiply
   105,575.18x = 145,638.52 × 65,276.06
4. Step 4: Simplify right side
   105,575.18x = 9,506,708,769.83
5. Step 5: Solve for x
   x = 9,506,708,769.83/105,575.18
6. Step 6: Final answer
   x = 90,046.82