Finding the Fourth Proportional to 105,365.28, 145,390.16 and 67,690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,365.28 : 145,390.16 = 67,690.72 : x
2. Step 2: Convert to fraction form
   105,365.28/145,390.16 = 67,690.72/x
3. Step 3: Cross multiply
   105,365.28x = 145,390.16 × 67,690.72
4. Step 4: Simplify right side
   105,365.28x = 9,841,564,611.32
5. Step 5: Solve for x
   x = 9,841,564,611.32/105,365.28
6. Step 6: Final answer
   x = 93,404.25