Finding the Fourth Proportional to 91.31, 137.00 and 42.59

Step by Step Solution

1. Step 1: Write the proportion equation
   91.31 : 137.00 = 42.59 : x
2. Step 2: Convert to fraction form
   91.31/137.00 = 42.59/x
3. Step 3: Cross multiply
   91.31x = 137.00 × 42.59
4. Step 4: Simplify right side
   91.31x = 5,833.93
5. Step 5: Solve for x
   x = 5,833.93/91.31
6. Step 6: Final answer
   x = 63.89