Finding the Fourth Proportional to 111,123.99, 166,732.13 and 71,188

Step by Step Solution

1. Step 1: Write the proportion equation
   111,123.99 : 166,732.13 = 71,188 : x
2. Step 2: Convert to fraction form
   111,123.99/166,732.13 = 71,188/x
3. Step 3: Cross multiply
   111,123.99x = 166,732.13 × 71,188
4. Step 4: Simplify right side
   111,123.99x = 11,869,326,870.44
5. Step 5: Solve for x
   x = 11,869,326,870.44/111,123.99
6. Step 6: Final answer
   x = 106,811.56