Finding the Fourth Proportional to 111,978, 154,532.88 and 61,680.24

Step by Step Solution

1. Step 1: Write the proportion equation
   111,978 : 154,532.88 = 61,680.24 : x
2. Step 2: Convert to fraction form
   111,978/154,532.88 = 61,680.24/x
3. Step 3: Cross multiply
   111,978x = 154,532.88 × 61,680.24
4. Step 4: Simplify right side
   111,978x = 9,531,625,126.29
5. Step 5: Solve for x
   x = 9,531,625,126.29/111,978
6. Step 6: Final answer
   x = 85,120.52