Finding the Fourth Proportional to 111,978.79, 154,530.70 and 61,677.79

Step by Step Solution

1. Step 1: Write the proportion equation
   111,978.79 : 154,530.70 = 61,677.79 : x
2. Step 2: Convert to fraction form
   111,978.79/154,530.70 = 61,677.79/x
3. Step 3: Cross multiply
   111,978.79x = 154,530.70 × 61,677.79
4. Step 4: Simplify right side
   111,978.79x = 9,531,111,522.63
5. Step 5: Solve for x
   x = 9,531,111,522.63/111,978.79
6. Step 6: Final answer
   x = 85,115.33