Finding the Fourth Proportional to 105,705.30, 145,796.04 and 67,491.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,705.30 : 145,796.04 = 67,491.12 : x
2. Step 2: Convert to fraction form
   105,705.30/145,796.04 = 67,491.12/x
3. Step 3: Cross multiply
   105,705.30x = 145,796.04 × 67,491.12
4. Step 4: Simplify right side
   105,705.30x = 9,839,938,031.16
5. Step 5: Solve for x
   x = 9,839,938,031.16/105,705.30
6. Step 6: Final answer
   x = 93,088.41