Finding the Fourth Proportional to 101.31, 151.99 and 42.77

Step by Step Solution

1. Step 1: Write the proportion equation
   101.31 : 151.99 = 42.77 : x
2. Step 2: Convert to fraction form
   101.31/151.99 = 42.77/x
3. Step 3: Cross multiply
   101.31x = 151.99 × 42.77
4. Step 4: Simplify right side
   101.31x = 6,501.15
5. Step 5: Solve for x
   x = 6,501.15/101.31
6. Step 6: Final answer
   x = 64.17