Finding the Fourth Proportional to 111,101.72, 166,541.81 and 71,686.53

Step by Step Solution

1. Step 1: Write the proportion equation
   111,101.72 : 166,541.81 = 71,686.53 : x
2. Step 2: Convert to fraction form
   111,101.72/166,541.81 = 71,686.53/x
3. Step 3: Cross multiply
   111,101.72x = 166,541.81 × 71,686.53
4. Step 4: Simplify right side
   111,101.72x = 11,938,804,100.39
5. Step 5: Solve for x
   x = 11,938,804,100.39/111,101.72
6. Step 6: Final answer
   x = 107,458.32