Finding the Fourth Proportional to 115,300.50, 159,114.69 and 64,999.50

Step by Step Solution

1. Step 1: Write the proportion equation
   115,300.50 : 159,114.69 = 64,999.50 : x
2. Step 2: Convert to fraction form
   115,300.50/159,114.69 = 64,999.50/x
3. Step 3: Cross multiply
   115,300.50x = 159,114.69 × 64,999.50
4. Step 4: Simplify right side
   115,300.50x = 10,342,375,292.66
5. Step 5: Solve for x
   x = 10,342,375,292.66/115,300.50
6. Step 6: Final answer
   x = 89,699.31