Finding the Fourth Proportional to 111,156.80, 153,415.76 and 65,860.28

Step by Step Solution

1. Step 1: Write the proportion equation
   111,156.80 : 153,415.76 = 65,860.28 : x
2. Step 2: Convert to fraction form
   111,156.80/153,415.76 = 65,860.28/x
3. Step 3: Cross multiply
   111,156.80x = 153,415.76 × 65,860.28
4. Step 4: Simplify right side
   111,156.80x = 10,104,004,910.01
5. Step 5: Solve for x
   x = 10,104,004,910.01/111,156.80
6. Step 6: Final answer
   x = 90,898.67