Finding the Fourth Proportional to 112,865.52, 155,755.80 and 65,128.80

Step by Step Solution

1. Step 1: Write the proportion equation
   112,865.52 : 155,755.80 = 65,128.80 : x
2. Step 2: Convert to fraction form
   112,865.52/155,755.80 = 65,128.80/x
3. Step 3: Cross multiply
   112,865.52x = 155,755.80 × 65,128.80
4. Step 4: Simplify right side
   112,865.52x = 10,144,188,347.04
5. Step 5: Solve for x
   x = 10,144,188,347.04/112,865.52
6. Step 6: Final answer
   x = 89,878.54