Finding the Fourth Proportional to 115,288.50, 159,100.56 and 64,987.50

Step by Step Solution

1. Step 1: Write the proportion equation
   115,288.50 : 159,100.56 = 64,987.50 : x
2. Step 2: Convert to fraction form
   115,288.50/159,100.56 = 64,987.50/x
3. Step 3: Cross multiply
   115,288.50x = 159,100.56 × 64,987.50
4. Step 4: Simplify right side
   115,288.50x = 10,339,547,643
5. Step 5: Solve for x
   x = 10,339,547,643/115,288.50
6. Step 6: Final answer
   x = 89,684.12