Finding the Fourth Proportional to 111,211.50, 166,398.72 and 77,996.40

Step by Step Solution

1. Step 1: Write the proportion equation
   111,211.50 : 166,398.72 = 77,996.40 : x
2. Step 2: Convert to fraction form
   111,211.50/166,398.72 = 77,996.40/x
3. Step 3: Cross multiply
   111,211.50x = 166,398.72 × 77,996.40
4. Step 4: Simplify right side
   111,211.50x = 12,978,501,124.61
5. Step 5: Solve for x
   x = 12,978,501,124.61/111,211.50
6. Step 6: Final answer
   x = 116,701.07