Finding the Fourth Proportional to 111,021.07, 153,212.72 and 60,720.07

Step by Step Solution

1. Step 1: Write the proportion equation
   111,021.07 : 153,212.72 = 60,720.07 : x
2. Step 2: Convert to fraction form
   111,021.07/153,212.72 = 60,720.07/x
3. Step 3: Cross multiply
   111,021.07x = 153,212.72 × 60,720.07
4. Step 4: Simplify right side
   111,021.07x = 9,303,087,083.29
5. Step 5: Solve for x
   x = 9,303,087,083.29/111,021.07
6. Step 6: Final answer
   x = 83,795.69