Finding the Fourth Proportional to 101.34, 139.86 and 57.69

Step by Step Solution

1. Step 1: Write the proportion equation
   101.34 : 139.86 = 57.69 : x
2. Step 2: Convert to fraction form
   101.34/139.86 = 57.69/x
3. Step 3: Cross multiply
   101.34x = 139.86 × 57.69
4. Step 4: Simplify right side
   101.34x = 8,068.52
5. Step 5: Solve for x
   x = 8,068.52/101.34
6. Step 6: Final answer
   x = 79.62