Finding the Fourth Proportional to 107,013.60, 159,817.52 and 85,985.52

Step by Step Solution

1. Step 1: Write the proportion equation
   107,013.60 : 159,817.52 = 85,985.52 : x
2. Step 2: Convert to fraction form
   107,013.60/159,817.52 = 85,985.52/x
3. Step 3: Cross multiply
   107,013.60x = 159,817.52 × 85,985.52
4. Step 4: Simplify right side
   107,013.60x = 13,741,992,562.31
5. Step 5: Solve for x
   x = 13,741,992,562.31/107,013.60
6. Step 6: Final answer
   x = 128,413.52