Finding the Fourth Proportional to 112,985.56, 155,921.89 and 65,243.08

Step by Step Solution

1. Step 1: Write the proportion equation
   112,985.56 : 155,921.89 = 65,243.08 : x
2. Step 2: Convert to fraction form
   112,985.56/155,921.89 = 65,243.08/x
3. Step 3: Cross multiply
   112,985.56x = 155,921.89 × 65,243.08
4. Step 4: Simplify right side
   112,985.56x = 10,172,823,790.11
5. Step 5: Solve for x
   x = 10,172,823,790.11/112,985.56
6. Step 6: Final answer
   x = 90,036.50