Finding the Fourth Proportional to 105,642, 145,759.86 and 62,631.57

Step by Step Solution

1. Step 1: Write the proportion equation
   105,642 : 145,759.86 = 62,631.57 : x
2. Step 2: Convert to fraction form
   105,642/145,759.86 = 62,631.57/x
3. Step 3: Cross multiply
   105,642x = 145,759.86 × 62,631.57
4. Step 4: Simplify right side
   105,642x = 9,129,168,874.78
5. Step 5: Solve for x
   x = 9,129,168,874.78/105,642
6. Step 6: Final answer
   x = 86,416.09